Jupyterlab

- Pin puppeteer to fix ci
([8260](https://github.com/jupyterlab/jupyterlab/pull/8260))
- Fix Save As for files without sessions
([8248](https://github.com/jupyterlab/jupyterlab/pull/8248))

April 2020

See the [JupyterLab
2.1](https://github.com/jupyterlab/jupyterlab/milestone/49?closed=1)
milestone on GitHub for the full list of pull requests and issues
closed.

User-facing changes

- Display the extension manager in the left sidebar by default. Users
will need to acknowledge the disclaimer in the extension manager
before using it.
([8050](https://github.com/jupyterlab/jupyterlab/pull/8050),
[8145](https://github.com/jupyterlab/jupyterlab/pull/8145))
- Added `blacklist and whitelist support <extension_listings>` for the
extension manager
([7989](https://github.com/jupyterlab/jupyterlab/pull/7989))
- Automatically link URLs in notebook output text
([8075](https://github.com/jupyterlab/jupyterlab/pull/8075),
[7393](https://github.com/jupyterlab/jupyterlab/issues/7393))
- Added a "Restart Kernel and Run All Cells..." button to the
notebook toolbar
([8024](https://github.com/jupyterlab/jupyterlab/pull/8024))

<img alt="The main JupyterLab toolbar with focus on the Restart Kernel and Run All Cells button." src="https://raw.githubusercontent.com/jupyterlab/jupyterlab/3.1.x/docs/source/getting_started/changelog_restartrunallbutton.png" class="jp-screenshot">

- Added a context menu item for opening a Markdown editor from the
Markdown preview
([7942](https://github.com/jupyterlab/jupyterlab/pull/7942))

- Support Node.js 10+
([8112](https://github.com/jupyterlab/jupyterlab/pull/8112),
[8083](https://github.com/jupyterlab/jupyterlab/issues/8083))

- Added a command to replace the selection in an editor with text
(inserting if there is no selection). This can be assigned a
keyboard shortcut, as shown below. We also added a command to go
through a series of commands and run the first enabled command.
([7908](https://github.com/jupyterlab/jupyterlab/pull/7908)) Here
is a keyboard shortcut to insert text in a currently-active notebook
editor:

js
{
command: "notebook:replace-selection",
selector: ".jp-Notebook",
keys: ["Ctrl L"],
args: {text: "lambda x: x"}
}


Here is a keyboard shortcut to insert text into an editor of the
currently active console, file editor, or notebook:

js
{
command: "apputils:run-first-enabled",
selector: "body",
keys: ["Ctrl L"],
args: {
commands: [
"console:replace-selection",
"fileeditor:replace-selection",
"notebook:replace-selection",
],
args: {text: "lambda x: x"}
}
}


For developers

- `NotebookWidgetFactory` is now a plugin so it can be overridden
([8066](https://github.com/jupyterlab/jupyterlab/pull/8066),
[7996](https://github.com/jupyterlab/jupyterlab/issues/7996))
- Many improvements to `LabIcon`: work with all SVG loaders, improve
performance, fix issue with menus from extensions
([8125](https://github.com/jupyterlab/jupyterlab/pull/8125))
- Change the header application area to a box panel, which means the
header area will display if its children set their minimum height
([8059](https://github.com/jupyterlab/jupyterlab/pull/8059),
[7279](https://github.com/jupyterlab/jupyterlab/issues/7279))
- JupyterLab's custom context menu is now disabled on all descendants
of a DOM element with a `data-jp-suppress-context-menu` attribute
([7877](https://github.com/jupyterlab/jupyterlab/pull/7877),
[7670](https://github.com/jupyterlab/jupyterlab/issues/7670))

Bugfixes

- Fix property inspector restoration on reload
([8114](https://github.com/jupyterlab/jupyterlab/pull/8114))
- Increase the timeout for yarn
([8104](https://github.com/jupyterlab/jupyterlab/pull/8104),
[8102](https://github.com/jupyterlab/jupyterlab/issues/8102))
- Fix find and replace with empty strings
([8100](https://github.com/jupyterlab/jupyterlab/pull/8100),
[8098](https://github.com/jupyterlab/jupyterlab/issues/8098))
- Select search text when focusing the search overlay
([8073](https://github.com/jupyterlab/jupyterlab/pull/8073),
[7932](https://github.com/jupyterlab/jupyterlab/pull/7932))
- Fix attaching images with spaces in their names to Markdown cells
([8095](https://github.com/jupyterlab/jupyterlab/pull/8095))
- Fix build errors by distributing the `.yarnrc` configuration with
the Python package
([8045](https://github.com/jupyterlab/jupyterlab/pull/8045))
- Throttle fetch requests in the setting registry's data connector
([7927](https://github.com/jupyterlab/jupyterlab/pull/7927))
- Close the gap between lines in notebook output
([7832](https://github.com/jupyterlab/jupyterlab/pull/7832),
[7760](https://github.com/jupyterlab/jupyterlab/pull/7760))

April 2020

See the [JupyterLab
2.0.2](https://github.com/jupyterlab/jupyterlab/milestone/50?closed=1)
milestone on GitHub for the full list of pull requests and issues
closed.

- Fix cell execution when recording timing
([8057](https://github.com/jupyterlab/jupyterlab/pull/8057),
[8056](https://github.com/jupyterlab/jupyterlab/issues/8056))
- Fix font settings for the editor
([8004](https://github.com/jupyterlab/jupyterlab/pull/8004),
[7910](https://github.com/jupyterlab/jupyterlab/issues/7910))
- Avoid redundant checkpoint calls on loading a notebook
([7926](https://github.com/jupyterlab/jupyterlab/pull/7926),
[7889](https://github.com/jupyterlab/jupyterlab/issues/7889))
- For developers: make kernel `IFuture.done` typings more correct by
not including `undefined`
([8032](https://github.com/jupyterlab/jupyterlab/pull/8032))

[v2.0.0](https://github.com/jupyterlab/jupyterlab/releases)

February 2020

Here are some highlights for this release. See the [JupyterLab
2.0](https://github.com/jupyterlab/jupyterlab/milestone/36?closed=1)
milestone on GitHub for the full list of pull requests and issues
closed.

User-facing changes

- New user interface for notebook cell tags
([7407](https://github.com/jupyterlab/jupyterlab/pull/7407),
[7786](https://github.com/jupyterlab/jupyterlab/pull/7786))

<img alt="Notebook cell tags in the left sidebar next to an open notebook." src="https://raw.githubusercontent.com/jupyterlab/jupyterlab/3.1.x/docs/source/getting_started/changelog_celltags.png" class="jp-screenshot">

- File info display when hovering on a file in the file browser
([7485](https://github.com/jupyterlab/jupyterlab/pull/7485),
[7352](https://github.com/jupyterlab/jupyterlab/issues/7352))

<img alt="The file browser with a tooltip describing a notebook's info like the name, size, and kernel." src="https://raw.githubusercontent.com/jupyterlab/jupyterlab/3.1.x/docs/source/getting_started/changelog_fileinfo.png" class="jp-screenshot">

- Support for searching outputs in notebooks
([7258](https://github.com/jupyterlab/jupyterlab/pull/7258))

<img alt="A notebook with multiple cells and the cell output searching in the upper right." src="https://raw.githubusercontent.com/jupyterlab/jupyterlab/3.1.x/docs/source/getting_started/changelog_searchoutput.png" class="jp-screenshot">

- `Ctrl Shift .` and `Ctrl Shift ,` shortcuts move focus to the next
and previous tab bar in the main area, respectively
([7673](https://github.com/jupyterlab/jupyterlab/pull/7673))

- `Shift Home` and `Shift End` shortcuts in a notebook select all
cells from the current cell to the top or bottom of a notebook,
respectively
([7177](https://github.com/jupyterlab/jupyterlab/pull/7177))

- Explicit "No Kernel" button in the kernel selection dialog for new
notebooks
([7647](https://github.com/jupyterlab/jupyterlab/pull/7647))

- Notebook `recordTiming` advanced setting to control whether
execution timing information is stored in notebook files
([7578](https://github.com/jupyterlab/jupyterlab/pull/7578))

- "Select current running or last run cell" command added (requires
notebook `recordTiming` advanced setting to be set to true)
([7551](https://github.com/jupyterlab/jupyterlab/pull/7551))

- Codemirror `lineWiseCopyCut` advanced setting to control the
behavior of the copy/cut keyboard shortcuts when there is no
selection
([7842](https://github.com/jupyterlab/jupyterlab/pull/7842))

- Refreshed the command palette and property inspector sidebar icons
and user interfaces
([7577](https://github.com/jupyterlab/jupyterlab/pull/7577),
[7038](https://github.com/jupyterlab/jupyterlab/issues/7038),
[7733](https://github.com/jupyterlab/jupyterlab/pull/7733),
[7732](https://github.com/jupyterlab/jupyterlab/issues/7732),
[7718](https://github.com/jupyterlab/jupyterlab/pull/7718),
[7686](https://github.com/jupyterlab/jupyterlab/issues/7686))

- "New File" and "New Markdown File" items in file browser context
menu ([7483](https://github.com/jupyterlab/jupyterlab/pull/7483),
[4280](https://github.com/jupyterlab/jupyterlab/issues/4280))

- "Download" item in File menu
([7480](https://github.com/jupyterlab/jupyterlab/pull/7480))

- "Restart Kernel and Run up to Selected Cell" item in notebook
Kernel menu
([7789](https://github.com/jupyterlab/jupyterlab/pull/7789),
[6746](https://github.com/jupyterlab/jupyterlab/issues/6746))

- In extension manager, the "enable" button is now only shown for
installed extensions
([7482](https://github.com/jupyterlab/jupyterlab/pull/7482))

- Dialogs can now be closed by clicking outside of them
([7885](https://github.com/jupyterlab/jupyterlab/pull/7885),
[3784](https://github.com/jupyterlab/jupyterlab/issues/3784))

- `documentsearch:startWithReplace` command to open the document find
overlay with replace. There is not currently a default keyboard
shortcut for this, but one can be assigned as a custom keyboard
shortcut in Advanced Settings.
([7725](https://github.com/jupyterlab/jupyterlab/pull/7725))

- `` added to the CSV Viewer delimiter options
([7367](https://github.com/jupyterlab/jupyterlab/pull/7367),
[6324](https://github.com/jupyterlab/jupyterlab/issues/6324))

- The JSON viewer now only displays structure hints for arrays and
empty objects for a more streamlined feel
([7227](https://github.com/jupyterlab/jupyterlab/pull/7227))

- Optional platform-aware keyboard shortcut fields `linuxKeys`,
`macKeys`, and `winKeys` in keyboard shortcut definitions
([7589](https://github.com/jupyterlab/jupyterlab/pull/7589))

js
{
command: "application:toggle-mode",
selector: "body",
linuxKeys: ["Ctrl Shift M"], // only linux
macKeys: ["Cmd Shift Z"], // only mac
winKeys: ["Ctrl Shift B"], // only windows
keys: ["Accel Shift U"] // default shortcut
}


- Added options for `jupyter lab clean` to clean specific parts of the
build, such as `--extensions`, `--settings`, `--static`, and `--all`
([7583](https://github.com/jupyterlab/jupyterlab/pull/7583),
[6734](https://github.com/jupyterlab/jupyterlab/pull/6734))

- Removed the vega 4 and vega-lite 2 renderers (vega 5 and vega-lite 4
is included in JupyterLab by default). These legacy renderers may be
available via custom extensions
([7650](https://github.com/jupyterlab/jupyterlab/pull/7650),
[7523](https://github.com/jupyterlab/jupyterlab/issues/7523),
[7658](https://github.com/jupyterlab/jupyterlab/pull/7658))

- JupyterHub users should use the `c.Spawner.default_url = '/lab'`
setting instead of the deprecated and now removed `labhubapp`
([7724](https://github.com/jupyterlab/jupyterlab/pull/7724))

For developers

See `extension_migration` for help in
migrating extensions to JupyterLab 2.0.

Backward incompatible changes

- Switch from `phosphor` to `lumino` dependencies.
([7582](https://github.com/jupyterlab/jupyterlab/pull/7582),
[7534](https://github.com/jupyterlab/jupyterlab/issues/7534),
[7763](https://github.com/jupyterlab/jupyterlab/pull/7763),
[7762](https://github.com/jupyterlab/jupyterlab/issues/7762),
[7595](https://github.com/jupyterlab/jupyterlab/pull/7595))
- Factor out the `settingsregistry` and `statedb` packages from
coreutils
([7681](https://github.com/jupyterlab/jupyterlab/pull/7681),
[7615](https://github.com/jupyterlab/jupyterlab/issues/7615))
- Rework services architecture (sessions, kernels, terminals). Among
these changes, `ClientSession` is renamed to `SessionContext` and
the `IKernelConnection.connectToComm` method is replaced with
`IKernelConnection.createComm` and `IKernelConnection.hasComm`
methods.
([7252](https://github.com/jupyterlab/jupyterlab/pull/7252),
[7674](https://github.com/jupyterlab/jupyterlab/pull/7674),
[7820](https://github.com/jupyterlab/jupyterlab/pull/7820),
[7694](https://github.com/jupyterlab/jupyterlab/pull/7694),
[7690](https://github.com/jupyterlab/jupyterlab/issues/7690),
[7682](https://github.com/jupyterlab/jupyterlab/pull/7682))
- Upgrade to TypeScript 3.7
([7522](https://github.com/jupyterlab/jupyterlab/pull/7522))
- Remove `polling` from coreutils in favor for `lumino/polling`
([7617](https://github.com/jupyterlab/jupyterlab/pull/7617))
- TypeScript strict null checking in core packages
([7657](https://github.com/jupyterlab/jupyterlab/pull/7657),
[7607](https://github.com/jupyterlab/jupyterlab/pull/7607))
- Update state database list method to query based on namespace match.
([7742](https://github.com/jupyterlab/jupyterlab/pull/7742),
[7257](https://github.com/jupyterlab/jupyterlab/issues/7257))
- Address code todo items and deprecations for 2.0
([7720](https://github.com/jupyterlab/jupyterlab/pull/7720),
[7724](https://github.com/jupyterlab/jupyterlab/pull/7724))
- Update Console panel tracker widgets
([7705](https://github.com/jupyterlab/jupyterlab/pull/7705),
[7726](https://github.com/jupyterlab/jupyterlab/issues/7726),
[7648](https://github.com/jupyterlab/jupyterlab/issues/7648),
[7645](https://github.com/jupyterlab/jupyterlab/pull/7645))
- Update contribution guide to require node v12+
([7479](https://github.com/jupyterlab/jupyterlab/pull/7479))
- New API for the `Running` sidebar extension
([6895](https://github.com/jupyterlab/jupyterlab/pull/6895),
[6876](https://github.com/jupyterlab/jupyterlab/issues/6876))
- Clean up handling of icons under unified LabIcon (
[7192](https://github.com/jupyterlab/jupyterlab/pull/7192)
[7700](https://github.com/jupyterlab/jupyterlab/pull/7700),
[7765](https://github.com/jupyterlab/jupyterlab/issues/7765),
[7767](https://github.com/jupyterlab/jupyterlab/pull/7767),
[7800](https://github.com/jupyterlab/jupyterlab/pull/7800),
[7846](https://github.com/jupyterlab/jupyterlab/pull/7846),
[7859](https://github.com/jupyterlab/jupyterlab/issues/7859),
[7864](https://github.com/jupyterlab/jupyterlab/pull/7864),
[7886](https://github.com/jupyterlab/jupyterlab/pull/7886))

Other changes

- New property inspector used to display the properties of the
currently selected main area widget
([7665](https://github.com/jupyterlab/jupyterlab/pull/7665),
[7664](https://github.com/jupyterlab/jupyterlab/issues/7664),
[7718](https://github.com/jupyterlab/jupyterlab/pull/7718),
[7686](https://github.com/jupyterlab/jupyterlab/issues/7686))
- Allow metadata for launcher items
([7654](https://github.com/jupyterlab/jupyterlab/pull/7654),
[7652](https://github.com/jupyterlab/jupyterlab/issues/7652))
- Allow default file browser to restore manually.
([7695](https://github.com/jupyterlab/jupyterlab/pull/7695),
[4009](https://github.com/jupyterlab/jupyterlab/issues/4009))
- Upgrade bundled yarn to 1.21.1
([7691](https://github.com/jupyterlab/jupyterlab/pull/7691),
[7692](https://github.com/jupyterlab/jupyterlab/issues/7692))
- Make session dialogs configurable
([7618](https://github.com/jupyterlab/jupyterlab/pull/7618),
[7616](https://github.com/jupyterlab/jupyterlab/issues/7616))
- Support transient editor configs
([7611](https://github.com/jupyterlab/jupyterlab/pull/7611),
[7295](https://github.com/jupyterlab/jupyterlab/issues/7295))
- Optionally force new browser tab
([7603](https://github.com/jupyterlab/jupyterlab/pull/7603),
[7602](https://github.com/jupyterlab/jupyterlab/issues/7602))
- Update core dependencies (e.g., `codemirror`, `xterm.js`,
`markdown`, `fontawesome`, etc.)
([7590](https://github.com/jupyterlab/jupyterlab/pull/7590),
[7194](https://github.com/jupyterlab/jupyterlab/issues/7194),
[7326](https://github.com/jupyterlab/jupyterlab/pull/7326),
[6479](https://github.com/jupyterlab/jupyterlab/issues/6479),
[7769](https://github.com/jupyterlab/jupyterlab/pull/7769))
- Add storybook to `ui-components`
([7588](https://github.com/jupyterlab/jupyterlab/pull/7588),
[6799](https://github.com/jupyterlab/jupyterlab/issues/6799))
- Add explicit documentation encouraging people to re-use lab
components
([7543](https://github.com/jupyterlab/jupyterlab/pull/7543))
- Enable TypeScript sourcemaps for debugging locally installed
labextensions
([7541](https://github.com/jupyterlab/jupyterlab/pull/7541))
- Add `UseSignal` example to the docs
([7519](https://github.com/jupyterlab/jupyterlab/pull/7519))
- Add `env` prop to kernel options
([7499](https://github.com/jupyterlab/jupyterlab/pull/7499))
- Add kernelspec metadata
([7229](https://github.com/jupyterlab/jupyterlab/pull/7229),
[7228](https://github.com/jupyterlab/jupyterlab/issues/7228))
- Allow different mimetypes for the clipboard data
([7202](https://github.com/jupyterlab/jupyterlab/pull/7202))
- Add password dialog to apputils
([7855](https://github.com/jupyterlab/jupyterlab/pull/7855))
- Alias phosphor packages to lumino to allow a deprecation period for
phosphor
([7893](https://github.com/jupyterlab/jupyterlab/pull/7893))
- Match react version in ui-components peerdependencies
([7794](https://github.com/jupyterlab/jupyterlab/pull/7794))
- Fix lint-staged for both win and mac
([7784](https://github.com/jupyterlab/jupyterlab/pull/7784))
- Update websocket workaround for node environments
([7780](https://github.com/jupyterlab/jupyterlab/pull/7780),
[6934](https://github.com/jupyterlab/jupyterlab/pull/6934))
- Fix handling of linked extensions
([7728](https://github.com/jupyterlab/jupyterlab/pull/7728),
[6738](https://github.com/jupyterlab/jupyterlab/issues/6738))
- Fix extension compatibility checks for prereleases and extensions
supporting multiple major versions of JupyterLab
([7723](https://github.com/jupyterlab/jupyterlab/pull/7723),
[7241](https://github.com/jupyterlab/jupyterlab/issues/7241),
[7919](https://github.com/jupyterlab/jupyterlab/pull/7919))
- Teach update-dependency about more range specifiers and make it
adopt the current range for any tag
([7709](https://github.com/jupyterlab/jupyterlab/pull/7709))
- Add support for giving a rank to items in the top area
([7278](https://github.com/jupyterlab/jupyterlab/pull/7278))
- Apply all options to the initial JupyterLab application instance
([7251](https://github.com/jupyterlab/jupyterlab/pull/7251))

Bugfixes

- "Copy Shareable Link" in the file browser context menu now
properly works in JupyterHub
([7906](https://github.com/jupyterlab/jupyterlab/pull/7906))
- Update Mathjax CDN in the cell and console examples
([7680](https://github.com/jupyterlab/jupyterlab/pull/7680))
- Revert ensure-max-old-space now that Node 12+ has better default
memory ceilings
([7677](https://github.com/jupyterlab/jupyterlab/pull/7677),
[7675](https://github.com/jupyterlab/jupyterlab/issues/7675))
- Resolve race condition between default file browser and tree urls.
([7676](https://github.com/jupyterlab/jupyterlab/pull/7676),
[4009](https://github.com/jupyterlab/jupyterlab/issues/4009))
- Fix handling of code editor refresh
([7672](https://github.com/jupyterlab/jupyterlab/pull/7672),
[7671](https://github.com/jupyterlab/jupyterlab/issues/7671))
- Start new notebooks in edit mode
([7666](https://github.com/jupyterlab/jupyterlab/pull/7666),
[6731](https://github.com/jupyterlab/jupyterlab/issues/6731))
- Use consistent versions of React
([7661](https://github.com/jupyterlab/jupyterlab/pull/7661),
[7655](https://github.com/jupyterlab/jupyterlab/issues/7655))
- Add scrollbar styles to nbconvert-css
([7653](https://github.com/jupyterlab/jupyterlab/pull/7653))
- Close output views when corresponding notebooks are closed
([7633](https://github.com/jupyterlab/jupyterlab/pull/7633),
[7301](https://github.com/jupyterlab/jupyterlab/issues/7301))
- Fixed incorrect white background for new command palette icon
([7609](https://github.com/jupyterlab/jupyterlab/pull/7609),
[7577](https://github.com/jupyterlab/jupyterlab/issues/7577))
- Block fetching the settings for a plugin that is disabled
([7147](https://github.com/jupyterlab/jupyterlab/pull/7147))
- When timing metadata changes, ensure signal fires
([7576](https://github.com/jupyterlab/jupyterlab/pull/7576))
- Prevent memory leaks in Vega renderer
([7564](https://github.com/jupyterlab/jupyterlab/pull/7564))
- Handle cell execution cancellation when cell is disposed
([7555](https://github.com/jupyterlab/jupyterlab/pull/7555),
[7554](https://github.com/jupyterlab/jupyterlab/issues/7554))
- Fix dropdown option style issue on Windows
([7513](https://github.com/jupyterlab/jupyterlab/pull/7513))
- Make sure label is linked to a control when checking for element
type ([7458](https://github.com/jupyterlab/jupyterlab/pull/7458))
- Refine log console message UX
([7448](https://github.com/jupyterlab/jupyterlab/pull/7448),
[7444](https://github.com/jupyterlab/jupyterlab/issues/7444),
[7443](https://github.com/jupyterlab/jupyterlab/issues/7443))
- Fix multicursor backspacing
([7401](https://github.com/jupyterlab/jupyterlab/pull/7401),
[7205](https://github.com/jupyterlab/jupyterlab/issues/7205))
- Reset log display and count when non-notebook tab gets activated
([7334](https://github.com/jupyterlab/jupyterlab/pull/7334),
[7325](https://github.com/jupyterlab/jupyterlab/issues/7325))
- Fix Safari multiple tabs by working around a Safari bug.
([7316](https://github.com/jupyterlab/jupyterlab/pull/7316),
[6921](https://github.com/jupyterlab/jupyterlab/issues/6921))
- Skip custom click behavior on links when the download attribute is
set ([7311](https://github.com/jupyterlab/jupyterlab/pull/7311),
[5443](https://github.com/jupyterlab/jupyterlab/issues/5443))
- Fix context menu hit test to deal with SVG nodes.
([7242](https://github.com/jupyterlab/jupyterlab/pull/7242),
[7224](https://github.com/jupyterlab/jupyterlab/issues/7224))
- Fix overwriting of target attribute of anchors rendered by
`IPython.display`
([7215](https://github.com/jupyterlab/jupyterlab/pull/7215),
[6827](https://github.com/jupyterlab/jupyterlab/issues/6827))
- Fix file browser location in tree view
([7155](https://github.com/jupyterlab/jupyterlab/pull/7155))
- Stop too many fetch calls in docmanager-extension
([7879](https://github.com/jupyterlab/jupyterlab/pull/7879),
[7874](https://github.com/jupyterlab/jupyterlab/pull/7874))
- Ensures that `Shift Tab` dedent shortcut works correctly in the file
editor
([7865](https://github.com/jupyterlab/jupyterlab/pull/7865))
- Fix unexpected jump to last search result when using documentsearch
([7835](https://github.com/jupyterlab/jupyterlab/pull/7835))
- Fixed refresh issue for html viewer
([7824](https://github.com/jupyterlab/jupyterlab/pull/7824),
[7552](https://github.com/jupyterlab/jupyterlab/pull/7552))
- Fix for center-aligned images with IPython.display.image
([7798](https://github.com/jupyterlab/jupyterlab/pull/7798))
- Changes to setting editor should trigger application dirty state
([7774](https://github.com/jupyterlab/jupyterlab/pull/7774),
[7757](https://github.com/jupyterlab/jupyterlab/issues/7757))
- Move vega from "devdependencies" to "dependencies"
([7699](https://github.com/jupyterlab/jupyterlab/pull/7699),
[7689](https://github.com/jupyterlab/jupyterlab/issues/7689))
- Restore default file browser manually.
([7695](https://github.com/jupyterlab/jupyterlab/pull/7695),
[4009](https://github.com/jupyterlab/jupyterlab/issues/4009))
- Use default `app_dir` when `app_dir` is `''`
([7268](https://github.com/jupyterlab/jupyterlab/pull/7268),
[7264](https://github.com/jupyterlab/jupyterlab/issues/7264))

October 29, 2019

Here are some highlights for this release. See the [JupyterLab
1.2.0](https://github.com/jupyterlab/jupyterlab/milestone/38?closed=1)
milestone on GitHub for the full list of pull requests and issues
closed.

User-facing changes

- Select cells from the current cell to the top of the notebook with
`Shift Home`, to the bottom of the notebook with `Shift End`
([7336](https://github.com/jupyterlab/jupyterlab/pull/7336),
[6783](https://github.com/jupyterlab/jupyterlab/pull/6783))
- Add a log console extension to display unhandled messages and other
activity
([7318](https://github.com/jupyterlab/jupyterlab/pull/7318),
[7319](https://github.com/jupyterlab/jupyterlab/pull/7319),
[7379](https://github.com/jupyterlab/jupyterlab/pull/7379),
[7399](https://github.com/jupyterlab/jupyterlab/pull/7399),
[7406](https://github.com/jupyterlab/jupyterlab/pull/7406),
[7421](https://github.com/jupyterlab/jupyterlab/pull/7421))
- Allow the npm `max-old-space` option to be specified outside of
JupyterLab
([7317](https://github.com/jupyterlab/jupyterlab/pull/7317))
- Only display node structure in a JSON tree view for arrays and empty
objects
([7261](https://github.com/jupyterlab/jupyterlab/pull/7261))
- Make much smaller distribution packages by not building JavaScript
source maps for releases.
([7150](https://github.com/jupyterlab/jupyterlab/pull/7150))
- Add support for pasting cell attachments and dragging attachments
from the file browser
([5913](https://github.com/jupyterlab/jupyterlab/pull/5913),
[5744](https://github.com/jupyterlab/jupyterlab/issues/5744))
- Add a new `registry` configuration parameter to override the default
yarn repository when building
([7363](https://github.com/jupyterlab/jupyterlab/pull/7363),
[7109](https://github.com/jupyterlab/jupyterlab/pull/7109),
[7249](https://github.com/jupyterlab/jupyterlab/pull/7249),
[7248](https://github.com/jupyterlab/jupyterlab/issues/7248))

For developers

- Update the Markdown renderer (`marked`) to 0.7.0
([7328](https://github.com/jupyterlab/jupyterlab/pull/7328))
- Remove datagrid as a singleton, allowing extensions to use newer
versions
([7312](https://github.com/jupyterlab/jupyterlab/pull/7312))
- Add metadata to the kernelspec information
([7234](https://github.com/jupyterlab/jupyterlab/pull/7234))
- Allow different mimetypes for the clipboard data
([7233](https://github.com/jupyterlab/jupyterlab/pull/7233))
- Add inline svg icon support to toolbar buttons
([7232](https://github.com/jupyterlab/jupyterlab/pull/7232))
- Add PageConfig functions to query if a plugin is deferred or
disabled
([7216](https://github.com/jupyterlab/jupyterlab/pull/7216))
- Allow for renderers for nbformat.ierror to be created
([7203](https://github.com/jupyterlab/jupyterlab/pull/7203),
[7193](https://github.com/jupyterlab/jupyterlab/issues/7193))
- Refactor `fileeditor-extension` for modularization
([6904](https://github.com/jupyterlab/jupyterlab/pull/6904))
- Add execution timing to cells
([6864](https://github.com/jupyterlab/jupyterlab/pull/6864),
[3320](https://github.com/jupyterlab/jupyterlab/issues/3320))

Bugfixes

- Fix the `file-browser-path` query parameter
([7313](https://github.com/jupyterlab/jupyterlab/pull/7313))
- Skip custom click behavior on links when the download attribute is
set ([7323](https://github.com/jupyterlab/jupyterlab/pull/7323))
- Fix opening multiple browser tabs in Safari
([7322](https://github.com/jupyterlab/jupyterlab/pull/7322))
- Fix context menus on SVG icons
([7263](https://github.com/jupyterlab/jupyterlab/pull/7263))
- Fix overwriting of target attribute of anchors rendered by
`IPython.display`
([7231](https://github.com/jupyterlab/jupyterlab/pull/7231))
- Fix multi-cursor backspacing
([7205](https://github.com/jupyterlab/jupyterlab/pull/7205),
[7401](https://github.com/jupyterlab/jupyterlab/pull/7401),
[7413](https://github.com/jupyterlab/jupyterlab/pull/7413))
- Fix mult-cursor cell splitting
([7207](https://github.com/jupyterlab/jupyterlab/pull/7207),
[7417](https://github.com/jupyterlab/jupyterlab/pull/7417),
[7419](https://github.com/jupyterlab/jupyterlab/pull/7419))

August 28, 2019

Here are some highlights of what is in this release. See the [JupyterLab
1.1.0](https://github.com/jupyterlab/jupyterlab/milestone/31?closed=1)
milestone on GitHub for the full list of pull requests and issues
closed.

User-facing changes

- `jupyter lab build` now has a `--minimize=False` option to build
without minimization to conserve memory and time
([6907](https://github.com/jupyterlab/jupyterlab/pull/6907))
- Fix workspace reset functionality
([7106](https://github.com/jupyterlab/jupyterlab/pull/7106),
[7105](https://github.com/jupyterlab/jupyterlab/issues/7105))
- Restore behavior of the "raises-exception" cell tag
([7020](https://github.com/jupyterlab/jupyterlab/pull/7020),
[7015](https://github.com/jupyterlab/jupyterlab/issues/7015))
- Add settings to override theme font sizes
([6926](https://github.com/jupyterlab/jupyterlab/pull/6926))
- Accept query parameter to optionally change file browser location
([6875](https://github.com/jupyterlab/jupyterlab/pull/6875))
- Pressing escape in the console should switch out of edit mode
([6822](https://github.com/jupyterlab/jupyterlab/pull/6822))
- Fix file browser downloads in Google Chrome
([6686](https://github.com/jupyterlab/jupyterlab/pull/6686))
- Make it possible to override the default widgets to view a file
([6813](https://github.com/jupyterlab/jupyterlab/pull/6813),
[4048](https://github.com/jupyterlab/jupyterlab/issues/4048))
- Support installing multiple versions of the same extension
([6857](https://github.com/jupyterlab/jupyterlab/pull/6857))
- Support JupyterHub server name for JupyterHub 1.0
([6931](https://github.com/jupyterlab/jupyterlab/pull/6931))
- Add docs to help users diagnose issues before creating them
([6971](https://github.com/jupyterlab/jupyterlab/pull/6971))
- The JupyterLab conda-forge package is now a `noarch`
package. If you are using JupyterLab with `notebook`
version 5.2 or earlier, you may need to manually enable the
JupyterLab server extension. See the issue for more details
([7042](https://github.com/jupyterlab/jupyterlab/issues/7042))

For developers

- Expose install_kernel for tests so that outside projects can better
use the testing framework
([7089](https://github.com/jupyterlab/jupyterlab/pull/7089))
- Fix `comm_info_request` content to conform to the Jupyter message
specification in a backwards-compatible way
([6949](https://github.com/jupyterlab/jupyterlab/pull/6949),
[6947](https://github.com/jupyterlab/jupyterlab/issues/6947))
- Add yarn package resolution to build to constrain core package
versions to patch semver ranges
([6938](https://github.com/jupyterlab/jupyterlab/pull/6938))
- Make handling comm messages optional in a kernel connection.
([6929](https://github.com/jupyterlab/jupyterlab/pull/6929))
- Expose icon svg to theme css
([6034](https://github.com/jupyterlab/jupyterlab/pull/6034),
[7027](https://github.com/jupyterlab/jupyterlab/pull/7027))
- Expose convenience functions for open dialogs
([6366](https://github.com/jupyterlab/jupyterlab/pull/6366),
[6365](https://github.com/jupyterlab/jupyterlab/issues/6365))
- Add debug messages to possible kernel messages
([6704](https://github.com/jupyterlab/jupyterlab/pull/6704))
- Add server side coreconfig object
([6991](https://github.com/jupyterlab/jupyterlab/pull/6991))

Bug fixes

- Handle errors that occur during kernel selection
([7094](https://github.com/jupyterlab/jupyterlab/pull/7094))
- Fix escaping issues for page config and other template variables
([7016](https://github.com/jupyterlab/jupyterlab/pull/7016),
[7024](https://github.com/jupyterlab/jupyterlab/issues/7024),
[7061](https://github.com/jupyterlab/jupyterlab/pull/7061),
[7058](https://github.com/jupyterlab/jupyterlab/issues/7058),
[6858](https://github.com/jupyterlab/jupyterlab/issues/6858))
- Require jinja2 2.10+ to fix escaping issues
([7055](https://github.com/jupyterlab/jupyterlab/pull/7055),
[7053](https://github.com/jupyterlab/jupyterlab/issues/7053))
- Increase the search debounce from 100ms to 500ms to increase
incremental search responsiveness in large documents
([7034](https://github.com/jupyterlab/jupyterlab/pull/7034))
- Fix vega downloads and download urls in general
([7022](https://github.com/jupyterlab/jupyterlab/pull/7022),
[7017](https://github.com/jupyterlab/jupyterlab/issues/7017),
[7098](https://github.com/jupyterlab/jupyterlab/pull/7098),
[7047](https://github.com/jupyterlab/jupyterlab/issues/7047))
- Do not complain in the build about duplicate or optional packages
([7013](https://github.com/jupyterlab/jupyterlab/pull/7013))
- Fix contextual help layout for R help
([6933](https://github.com/jupyterlab/jupyterlab/pull/6933),
[6935](https://github.com/jupyterlab/jupyterlab/pull/6935))

June 28, 2019

See the [JupyterLab
1.0.0](https://github.com/jupyterlab/jupyterlab/milestone/2?closed=1)
milestone on GitHub for the full list of pull requests and issues closed
in 1.0.0, and other 1.0.x milestones for bugs fixed in patch releases.

Find and Replace

<img alt="A notebook with multiple cells and the find and replace interface in the upper right." src="https://raw.githubusercontent.com/jupyterlab/jupyterlab/3.1.x/docs/source/getting_started/find.png" class="jp-screenshot">

We have added first class support for find and replace across
JupyterLab. It is currently supported in notebooks and text files and is
extensible for other widgets who wish to support it.
([6350](https://github.com/jupyterlab/jupyterlab/pull/6350),
[6322](https://github.com/jupyterlab/jupyterlab/issues/6322),
[6301](https://github.com/jupyterlab/jupyterlab/pull/6301),
[6282](https://github.com/jupyterlab/jupyterlab/pull/6282),
[6256](https://github.com/jupyterlab/jupyterlab/pull/6256),
[6241](https://github.com/jupyterlab/jupyterlab/pull/6241),
[6237](https://github.com/jupyterlab/jupyterlab/pull/6237),
[6159](https://github.com/jupyterlab/jupyterlab/pull/6159),
[6081](https://github.com/jupyterlab/jupyterlab/issues/6081),
[6155](https://github.com/jupyterlab/jupyterlab/pull/6155),
[6094](https://github.com/jupyterlab/jupyterlab/pull/6094),
[6024](https://github.com/jupyterlab/jupyterlab/pull/6024),
[5937](https://github.com/jupyterlab/jupyterlab/pull/5937),
[5795](https://github.com/jupyterlab/jupyterlab/pull/5795),
[1074](https://github.com/jupyterlab/jupyterlab/issues/1074))

Status Bar

<img alt="A screenshot of the updated JupyterLab status bar." src="https://raw.githubusercontent.com/jupyterlab/jupyterlab/3.1.x/docs/source/getting_started/statusbar.png" class="jp-screenshot">

We have integrated the [JupyterLab Status Bar
package](https://github.com/jupyterlab/jupyterlab-statusbar) package
into the core distribution. Extensions can add their own status to it as
well ([5577](https://github.com/jupyterlab/jupyterlab/pull/5577),
[5525](https://github.com/jupyterlab/jupyterlab/pull/5525)
[5990](https://github.com/jupyterlab/jupyterlab/pull/5990),
[5982](https://github.com/jupyterlab/jupyterlab/issues/5982),
[5514](https://github.com/jupyterlab/jupyterlab/pull/5514),
[5508](https://github.com/jupyterlab/jupyterlab/pull/5508),
[5352](https://github.com/jupyterlab/jupyterlab/issues/5352)).

JupyterHub Integration

- We now include the JupyterHub extension in core JupyterLab, so you
no longer need to install `jupyterlab/hub-extension`.
([6451](https://github.com/jupyterlab/jupyterlab/pull/6451),
[6428](https://github.com/jupyterlab/jupyterlab/issues/6428))
- JupyterLab now has a File > Logout menu entry when running with
JupyterHub
([6087](https://github.com/jupyterlab/jupyterlab/pull/6087),
[5966](https://github.com/jupyterlab/jupyterlab/issues/5966))

Printing

We now have a printing system that allows extensions to customize how
documents and activities are printed.
([5850](https://github.com/jupyterlab/jupyterlab/pull/5850),
[1314](https://github.com/jupyterlab/jupyterlab/issues/1314))

Other User Facing Changes

- The launcher displays longer kernel names and supports keyboard
navigation
([6587](https://github.com/jupyterlab/jupyterlab/pull/6587))
- Notebook outputs without any valid MimeType renderers will not be
displayed, instead of displaying an error
([6559](https://github.com/jupyterlab/jupyterlab/pull/6559),
[6216](https://github.com/jupyterlab/jupyterlab/issues/6216))
- Add tooltip to file browser root breadcrumb icon showing the server
root, if it is available
([6552](https://github.com/jupyterlab/jupyterlab/pull/6552))
- Downloading a file will no longer open a new browser window
([6546](https://github.com/jupyterlab/jupyterlab/pull/6546))
- Rename the help "Inspector" to "Contextual Help" and move it to
the "Help" menu
([6493](https://github.com/jupyterlab/jupyterlab/pull/6493),
[6488](https://github.com/jupyterlab/jupyterlab/issues/6488),
[6678](https://github.com/jupyterlab/jupyterlab/pull/6678),
[6671](https://github.com/jupyterlab/jupyterlab/pull/6671))
- Update many of the icons to make them more consistent
([6672](https://github.com/jupyterlab/jupyterlab/pull/6672),
[6618](https://github.com/jupyterlab/jupyterlab/issues/6618),
[6664](https://github.com/jupyterlab/jupyterlab/pull/6664),
[6621](https://github.com/jupyterlab/jupyterlab/issues/6621))
- Update the settings UI to remove the table view
([6654](https://github.com/jupyterlab/jupyterlab/pull/6654),
[6622](https://github.com/jupyterlab/jupyterlab/issues/6622),
[6653](https://github.com/jupyterlab/jupyterlab/pull/6653),
[6623](https://github.com/jupyterlab/jupyterlab/issues/6623),
[6646](https://github.com/jupyterlab/jupyterlab/pull/6646),
[6642](https://github.com/jupyterlab/jupyterlab/issues/6642))
- Replace FAQ Extension with link to JupyterLab documentation
([6628](https://github.com/jupyterlab/jupyterlab/pull/6628),
[6608](https://github.com/jupyterlab/jupyterlab/issues/6608),
[6625](https://github.com/jupyterlab/jupyterlab/pull/6625),
[6610](https://github.com/jupyterlab/jupyterlab/issues/6610))
- Change the default keyboard shortcut for closing a tab to be `Alt+w`
instead of `Cmd/Ctrl+w` to avoid conflicts with operating systems.
([6486](https://github.com/jupyterlab/jupyterlab/pull/6486),
[6357](https://github.com/jupyterlab/jupyterlab/issues/6357))
- Show help text in Inspector window to describe you should select a
function
([6476](https://github.com/jupyterlab/jupyterlab/pull/6476))
- Fixes SVG rendering
([6469](https://github.com/jupyterlab/jupyterlab/pull/6469),
[6295](https://github.com/jupyterlab/jupyterlab/issues/6295))
- Add support for dropping a tab in the tab bar area.
([6454](https://github.com/jupyterlab/jupyterlab/pull/6454),
[5406](https://github.com/jupyterlab/jupyterlab/issues/5406))
- Switch some default shortcuts to use `Accel` instead of `Ctrl` so
they are more natural for Mac users
([6447](https://github.com/jupyterlab/jupyterlab/pull/6447),
[5023](https://github.com/jupyterlab/jupyterlab/issues/5023))
- Add ability to tell between hover and selected command palette items
([6407](https://github.com/jupyterlab/jupyterlab/pull/6407),
[279](https://github.com/jupyterlab/jupyterlab/issues/279))
- Hide the "Last Modified" column when the file browser is narrow
([6406](https://github.com/jupyterlab/jupyterlab/pull/6406),
[6093](https://github.com/jupyterlab/jupyterlab/issues/6093))
- Support copy/paste in terminal and Mac OS using `Ctrl+C` and
`Ctrl+V`
([6391](https://github.com/jupyterlab/jupyterlab/pull/6391),
[6385](https://github.com/jupyterlab/jupyterlab/issues/6385),
[1146](https://github.com/jupyterlab/jupyterlab/issues/1146))
- Support scrolling in running kernels panel
([6383](https://github.com/jupyterlab/jupyterlab/pull/6383),
[6371](https://github.com/jupyterlab/jupyterlab/issues/6371))
- Adds ability to "Merge Selected Cells" in the context menu in the
notebook
([6375](https://github.com/jupyterlab/jupyterlab/pull/6375),
[6318](https://github.com/jupyterlab/jupyterlab/issues/6318))
- Turn On Accessibility In Xterm.js to make it more compatible for
screen readers
([6359](https://github.com/jupyterlab/jupyterlab/pull/6359))
- When selecting cells using the keyboard shortcuts, we now skip
collapsed cells
([6356](https://github.com/jupyterlab/jupyterlab/pull/6356),
[3233](https://github.com/jupyterlab/jupyterlab/issues/3233))
- Supporting opening `.geojson` files in JSON viewer
([6349](https://github.com/jupyterlab/jupyterlab/pull/6349))
- Performance fixes for text-based progress bars
([6304](https://github.com/jupyterlab/jupyterlab/pull/6304),
[4202](https://github.com/jupyterlab/jupyterlab/issues/4202))
- Add support for rendering Vega 5 and Vega Lite 3 while keeping the
existing Vega 4 and Vega Lite 2 renderers
([6294](https://github.com/jupyterlab/jupyterlab/pull/6294),
[6133](https://github.com/jupyterlab/jupyterlab/pull/6133),
[6128](https://github.com/jupyterlab/jupyterlab/issues/6128),
[6689](https://github.com/jupyterlab/jupyterlab/pull/6689),
[6685](https://github.com/jupyterlab/jupyterlab/pull/6685),
[6684](https://github.com/jupyterlab/jupyterlab/issues/6684),
[6675](https://github.com/jupyterlab/jupyterlab/issues/6675),
[6591](https://github.com/jupyterlab/jupyterlab/pull/6591),
[6572](https://github.com/jupyterlab/jupyterlab/issues/6572))
- Drag and drop console cells into a notebook or text editor
([5585](https://github.com/jupyterlab/jupyterlab/pull/5585),
[4847](https://github.com/jupyterlab/jupyterlab/issues/4847))
- Drag and drop notebook cells into a console or text editor
([5571](https://github.com/jupyterlab/jupyterlab/pull/5571),
[3732](https://github.com/jupyterlab/jupyterlab/issues/3732))
- The extension manager search now sorts extensions by the score
assigned to them by NPM instead of alphabetically
([5649](https://github.com/jupyterlab/jupyterlab/pull/5649))
- Notify the user when a kernel is automatically restarted, for
example, if crashes from an out of memory error
([6246](https://github.com/jupyterlab/jupyterlab/pull/6246),
[4273](https://github.com/jupyterlab/jupyterlab/issues/4273))
- Expose the extension manager in a command and menu item
([6200](https://github.com/jupyterlab/jupyterlab/pull/6200))
- Add command to render all Markdown cells
([6029](https://github.com/jupyterlab/jupyterlab/pull/6029),
[6017](https://github.com/jupyterlab/jupyterlab/issues/6017))
- Supports using shift to select text in output area
([6015](https://github.com/jupyterlab/jupyterlab/pull/6015),
[4800](https://github.com/jupyterlab/jupyterlab/issues/4800))
- Output areas that opened in new views are restored properly now on
reload
([5981](https://github.com/jupyterlab/jupyterlab/pull/5981),
[5976](https://github.com/jupyterlab/jupyterlab/issues/5976))
- Add support for managing notebook metadata under a new "Advanced
Tools" section in the cell tools area. The cell and notebook
metadata now always reflect the current state of the notebook
([5968](https://github.com/jupyterlab/jupyterlab/pull/5968),
[5200](https://github.com/jupyterlab/jupyterlab/issues/5200))
- Inherit terminal theme from core theme
([5964](https://github.com/jupyterlab/jupyterlab/pull/5964))
- Adds a built-in HTML viewer so that you can view HTML files
([5962](https://github.com/jupyterlab/jupyterlab/pull/5962),
[5855](https://github.com/jupyterlab/jupyterlab/pull/5855),
[2369](https://github.com/jupyterlab/jupyterlab/issues/2369))
- New workspaces are now automatically generated when you create a new
window with the same workspace name.
([5950](https://github.com/jupyterlab/jupyterlab/pull/5950),
[5854](https://github.com/jupyterlab/jupyterlab/issues/5854),
[5830](https://github.com/jupyterlab/jupyterlab/pull/5830),
[5214](https://github.com/jupyterlab/jupyterlab/issues/5214))
- We now add a hint to the context menu to describe how you can access
the native browser menu
([5940](https://github.com/jupyterlab/jupyterlab/pull/5940),
[4023](https://github.com/jupyterlab/jupyterlab/issues/4023))
- The tabs on the left panel have changed to make them more
understandable
([5920](https://github.com/jupyterlab/jupyterlab/pull/5920),
[5269](https://github.com/jupyterlab/jupyterlab/issues/5269))
- Start a new terminal when the page is refreshed and the old terminal
has died
([5917](https://github.com/jupyterlab/jupyterlab/pull/5917))
- Add a command to open the main menus, which can be assigned to a
keyboard shortcut to open and navigate menus without a mouse
([5910](https://github.com/jupyterlab/jupyterlab/pull/5910),
[3074](https://github.com/jupyterlab/jupyterlab/issues/3074))
- The contextual help now updates based on changes in the cursor from
the mouse instead of just from the keyboard
([5906](https://github.com/jupyterlab/jupyterlab/pull/5906),
[5899](https://github.com/jupyterlab/jupyterlab/issues/5899))
- The launcher now updates when the kernels change on the server
([5904](https://github.com/jupyterlab/jupyterlab/pull/5904),
[5676](https://github.com/jupyterlab/jupyterlab/issues/5676))
- Retain cell auto scroll behavior even when a cell output is cleared
([5817](https://github.com/jupyterlab/jupyterlab/pull/5817),
[4028](https://github.com/jupyterlab/jupyterlab/issues/4028))
- If you link to a relative path that is not a file in a markdown
cell, this will now be preserved instead of changing it to a file
URL ([5814](https://github.com/jupyterlab/jupyterlab/pull/5814))
- Adds the ability to link to a certain row in a CSV file and have the
viewer open to that row
([5727](https://github.com/jupyterlab/jupyterlab/pull/5727),
[5720](https://github.com/jupyterlab/jupyterlab/issues/5720))
- We have improved the performance of switching to a large notebook
([5700](https://github.com/jupyterlab/jupyterlab/pull/5700),
[4292](https://github.com/jupyterlab/jupyterlab/issues/4292),
[2639](https://github.com/jupyterlab/jupyterlab/issues/2639))
- The vdom extension now supports event handling, so that you can have
kernel code run in response to user interaction with the UI
([5670](https://github.com/jupyterlab/jupyterlab/pull/5670))
- Adds the ability to run "Run All Code" and "Restart Kernel and
Run All Code" in code and markdown files
([5641](https://github.com/jupyterlab/jupyterlab/pull/5641),
[5579](https://github.com/jupyterlab/jupyterlab/issues/5579))
- We now remember what line ending a text file has when loading it, so
that files with `CRLF` line endings will properly be saved with the
same endings
([5622](https://github.com/jupyterlab/jupyterlab/pull/5622),
[4464](https://github.com/jupyterlab/jupyterlab/issues/4464),
[3901](https://github.com/jupyterlab/jupyterlab/issues/3901),
[3706](https://github.com/jupyterlab/jupyterlab/issues/3706))
- Fixes rendering of SVG elements in HTML MimeType output
([5610](https://github.com/jupyterlab/jupyterlab/pull/5610),
[5610](https://github.com/jupyterlab/jupyterlab/issues/5610),
[5589](https://github.com/jupyterlab/jupyterlab/issues/5589))
- Allow copying files by holding down `Ctrl` when dragging them in the
file browser
([5584](https://github.com/jupyterlab/jupyterlab/pull/5584),
[3235](https://github.com/jupyterlab/jupyterlab/issues/3235))
- Switch the hover modified time in the file browser to use the local
format
([5567](https://github.com/jupyterlab/jupyterlab/pull/5567))
- We have added a default keyboard shortcut of `Ctrl Shift Q` for
closing and cleaning up a file
([5534](https://github.com/jupyterlab/jupyterlab/pull/5534),
[4390](https://github.com/jupyterlab/jupyterlab/issues/4390))
- Adds the ability to find and go to a certain line in the CSV viewer
([5523](https://github.com/jupyterlab/jupyterlab/pull/5523))
- Add the ability to create new text and markdown files from the
launcher and command palette
([5512](https://github.com/jupyterlab/jupyterlab/pull/5512),
[5511](https://github.com/jupyterlab/jupyterlab/pull/5511))
- A "New Folder" option has been added to the file browser context
menu ([5447](https://github.com/jupyterlab/jupyterlab/pull/5447))
- The ANSI colors are now the same as those in the classic notebook
([5336](https://github.com/jupyterlab/jupyterlab/pull/5336),
[3773](https://github.com/jupyterlab/jupyterlab/issues/3773))
- Send complete statements instead of current lines when stepping
through code in a cell
([6515](https://github.com/jupyterlab/jupyterlab/pull/6515),
[6063](https://github.com/jupyterlab/jupyterlab/pull/6063))
- Description list styles (`dl`, `dt`, `dd`) are improved to be
consistent with the nteract project
([5682](https://github.com/jupyterlab/jupyterlab/pull/5682),
[2399](https://github.com/jupyterlab/jupyterlab/issues/2399))

Settings

- The settings system has been rewritten
([5470](https://github.com/jupyterlab/jupyterlab/pull/5470),
[5298](https://github.com/jupyterlab/jupyterlab/issues/5298)) and
now uses json5 as the syntax, which supports comments and other
features for better human readability
([6343](https://github.com/jupyterlab/jupyterlab/pull/6343),
[6199](https://github.com/jupyterlab/jupyterlab/issues/6199)).
- The keyboard shortcut system has been rewritten and now displays a
list of system commands in the settings comments
([5812](https://github.com/jupyterlab/jupyterlab/pull/5812),
[5562](https://github.com/jupyterlab/jupyterlab/issues/5562)).

There are new settings for many following items, including:

- Adds an option to shut down terminals and notebook kernels when they
are closed
([6285](https://github.com/jupyterlab/jupyterlab/pull/6285),
[6275](https://github.com/jupyterlab/jupyterlab/pull/6275))
- Scrolling past the end of a notebooks and text editor document
([5542](https://github.com/jupyterlab/jupyterlab/pull/5542),
[5271](https://github.com/jupyterlab/jupyterlab/issues/5271),
[5652](https://github.com/jupyterlab/jupyterlab/pull/5652),
[4429](https://github.com/jupyterlab/jupyterlab/issues/4429))
- Text editor code folding, rulers, and active line highlighting
([5761](https://github.com/jupyterlab/jupyterlab/pull/5761),
[4083](https://github.com/jupyterlab/jupyterlab/issues/4083),
[5750](https://github.com/jupyterlab/jupyterlab/pull/5750),
[4179](https://github.com/jupyterlab/jupyterlab/issues/4179),
[5529](https://github.com/jupyterlab/jupyterlab/pull/5529),
[5528](https://github.com/jupyterlab/jupyterlab/issues/5528))
- Markdown viewer options
([5901](https://github.com/jupyterlab/jupyterlab/pull/5901),
[3940](https://github.com/jupyterlab/jupyterlab/issues/3940))
- Terminal scrollback and other settings
([5609](https://github.com/jupyterlab/jupyterlab/pull/5609),
[3985](https://github.com/jupyterlab/jupyterlab/issues/3985))
- The autosave interval
([5645](https://github.com/jupyterlab/jupyterlab/pull/5645),
[5619](https://github.com/jupyterlab/jupyterlab/issues/5619))
- The file browser showing the current active file
([5698](https://github.com/jupyterlab/jupyterlab/pull/5698),
[4258](https://github.com/jupyterlab/jupyterlab/issues/4258))
- Custom scrollbar styling for dark themes
([6026](https://github.com/jupyterlab/jupyterlab/pull/6026),
[4867](https://github.com/jupyterlab/jupyterlab/issues/4867))

Command Line Changes

- Installing extensions will be quieter and adds a `--debug` to
extension installing
([6567](https://github.com/jupyterlab/jupyterlab/pull/6567),
[6499](https://github.com/jupyterlab/jupyterlab/issues/6499),
[5986](https://github.com/jupyterlab/jupyterlab/issues/5986))
- We now support running JupyterLab when its application directory is
a symlink
([6240](https://github.com/jupyterlab/jupyterlab/pull/6240),
[6166](https://github.com/jupyterlab/jupyterlab/issues/6166))
- Add `--all` flag to `labextension uninstall` to remove all
extensions
([6058](https://github.com/jupyterlab/jupyterlab/pull/6058),
[6006](https://github.com/jupyterlab/jupyterlab/issues/6006))
- Adds the ability to override the base URLs from the config
([5518](https://github.com/jupyterlab/jupyterlab/pull/5518),
[5503](https://github.com/jupyterlab/jupyterlab/pull/5503))
- Updates to workspaces CLI command
([6473](https://github.com/jupyterlab/jupyterlab/pull/6473),
[5977](https://github.com/jupyterlab/jupyterlab/issues/5977),
[6276](https://github.com/jupyterlab/jupyterlab/pull/6276),
[6234](https://github.com/jupyterlab/jupyterlab/pull/6234),
[6210](https://github.com/jupyterlab/jupyterlab/issues/6210),
[5975](https://github.com/jupyterlab/jupyterlab/pull/5975),
[5695](https://github.com/jupyterlab/jupyterlab/pull/5695),
[5694](https://github.com/jupyterlab/jupyterlab/issues/5694))

Extension Development Changes

- We have rewritten how extensions provide keyboard shortcuts and
interact with the settings system. If you previously defined
keyboard shortcuts or used the settings mechanism, you will need to
update your extension
([5470](https://github.com/jupyterlab/jupyterlab/pull/5470),
[5298](https://github.com/jupyterlab/jupyterlab/issues/5298))
- We have renamed the plugin type from `JupyterLabPlugin` to
`JupyterFrontEndPlugin`. The application arg is also renamed from
`JupyterLab` to `JupyterFrontEnd` and some its functionality has
been moved to a separate `ILabShell` plugin
([5845](https://github.com/jupyterlab/jupyterlab/pull/5845),
[5919](https://github.com/jupyterlab/jupyterlab/pull/5919))
- The lab shell `addToMainArea`, `addToLeftArea`, `addToTopArea`,
`addToRightArea`, and `addToBottomArea` functions have been replaced
with a single `add()` function that takes the area as an argument.
Replace `addToMainArea(widget, options)` with
`add(widget, 'main', options)`, etc.
([5845](https://github.com/jupyterlab/jupyterlab/pull/5845))
- Rename `pageUrl` to `appUrl` in the server connection
([6509](https://github.com/jupyterlab/jupyterlab/pull/6509),
[6508](https://github.com/jupyterlab/jupyterlab/issues/6508),
[6585](https://github.com/jupyterlab/jupyterlab/pull/6585),
[6584](https://github.com/jupyterlab/jupyterlab/issues/6584))
- `MainAreaWidget` instances now forward update requests to their
`content`
([6586](https://github.com/jupyterlab/jupyterlab/pull/6586),
[6571](https://github.com/jupyterlab/jupyterlab/issues/6571))
- The theme data attributes are renamed and moved to the document body
element. If you are relying on these attributes in CSS to
conditionally style based on the theme, you should update their
names. For example `data-theme-light` is now `data-jp-theme-light`.
([6566](https://github.com/jupyterlab/jupyterlab/pull/6566),
[6554](https://github.com/jupyterlab/jupyterlab/issues/6554))
- Extensions which require CSS should no longer import their CSS files
into their Javascript files. Instead, they should specify a root CSS
file in the `style` attribute in their `package.json`, and
JupyterLab will automatically import that CSS file.
([6533](https://github.com/jupyterlab/jupyterlab/pull/6533),
[6530](https://github.com/jupyterlab/jupyterlab/issues/6530),
[6395](https://github.com/jupyterlab/jupyterlab/pull/6395),
[6390](https://github.com/jupyterlab/jupyterlab/issues/6390))
- `Dialog.prompt` has been replaced by a number of type-specific
dialogs such as `InputDialog.getString`, `InputDialog.getBoolean`,
etc. ([6522](https://github.com/jupyterlab/jupyterlab/pull/6522),
[6378](https://github.com/jupyterlab/jupyterlab/issues/6378),
[6327](https://github.com/jupyterlab/jupyterlab/pull/6327),
[6326](https://github.com/jupyterlab/jupyterlab/issues/6326))
- When a `RenderMime` widget is re-rendered, the default behavior is
to remove any existing content in the DOM. This can be overridden if
needed.
([6513](https://github.com/jupyterlab/jupyterlab/pull/6513),
[6505](https://github.com/jupyterlab/jupyterlab/issues/6505),
[6497](https://github.com/jupyterlab/jupyterlab/issues/6497))
- We have updated our internal TypeScript version to 3.5.1 and our
compile target to `ES2017`. Extensions may need to upgrade their
TypeScript version and target as well.
([6440](https://github.com/jupyterlab/jupyterlab/pull/6440),
[6224](https://github.com/jupyterlab/jupyterlab/pull/6224))
- We have updated the typings for some of the Kernel messages so that
they better match the spec.
([6433](https://github.com/jupyterlab/jupyterlab/pull/6433))
- A `connectionFailure` signal has been added to some of the manager
classes, which can be used to detect when a connection to the server
is lost
([6399](https://github.com/jupyterlab/jupyterlab/pull/6399),
[6176](https://github.com/jupyterlab/jupyterlab/issues/6176),
[3324](https://github.com/jupyterlab/jupyterlab/issues/3324))
- Add rate limiting and polling utilities to `coreutils` to use for
throttling and debouncing of API requests
([6345](https://github.com/jupyterlab/jupyterlab/pull/6345),
[6346](https://github.com/jupyterlab/jupyterlab/issues/6346),
[6401](https://github.com/jupyterlab/jupyterlab/pull/6401),
[6305](https://github.com/jupyterlab/jupyterlab/pull/6305),
[6157](https://github.com/jupyterlab/jupyterlab/issues/6157),
[6192](https://github.com/jupyterlab/jupyterlab/pull/6192),
[6186](https://github.com/jupyterlab/jupyterlab/pull/6186),
[6141](https://github.com/jupyterlab/jupyterlab/pull/6141),
[3929](https://github.com/jupyterlab/jupyterlab/issues/3929),
[6141](https://github.com/jupyterlab/jupyterlab/pull/6141),
[3929](https://github.com/jupyterlab/jupyterlab/issues/3929),
[6186](https://github.com/jupyterlab/jupyterlab/pull/6186),
[6192](https://github.com/jupyterlab/jupyterlab/pull/6192),
[6401](https://github.com/jupyterlab/jupyterlab/pull/6401)
,[6305](https://github.com/jupyterlab/jupyterlab/pull/6305),
[6157](https://github.com/jupyterlab/jupyterlab/issues/6157))
- Require session when instantiating terminal widget
([6339](https://github.com/jupyterlab/jupyterlab/pull/6339),
[5061](https://github.com/jupyterlab/jupyterlab/issues/5061))
- Provides a signal to see what items are opened in a directory
listing
([6270](https://github.com/jupyterlab/jupyterlab/pull/6270),
[6269](https://github.com/jupyterlab/jupyterlab/issues/6269))
- Ads the ability to add widget above the main work area to a top
header area
([5936](https://github.com/jupyterlab/jupyterlab/pull/5936))
- Renames `contextMenuFirst` to `contextMenuHitTest` in the
`JupyterFrontEnd`
([5932](https://github.com/jupyterlab/jupyterlab/pull/5932))
- Removes the `initialCommand` arg from the terminal creation command.
([5916](https://github.com/jupyterlab/jupyterlab/pull/5916))
- Adds `--jp-code-cursor-width0`, `--jp-code-cursor-width1`, and
`--jp-code-cursor-width2` variables to the themes to support
changing the cursor width if you change the font size
([5898](https://github.com/jupyterlab/jupyterlab/pull/5898))
- Adds the ability to insert a new item to the toolbar before or after
another item
([5896](https://github.com/jupyterlab/jupyterlab/pull/5896),
[5894](https://github.com/jupyterlab/jupyterlab/issues/5894))
- Adds the ability for extensions to register new CodeMirror modes
([5829](https://github.com/jupyterlab/jupyterlab/pull/5829))
- We have removed the `JUPYTERLAB_xxx_LOADER` Webpack loaders, instead
you should use the loader directly in the URL as Webpack supports it
([5709](https://github.com/jupyterlab/jupyterlab/pull/5709),
[4406](https://github.com/jupyterlab/jupyterlab/issues/4406))
- Adds the ability to handle fragments for document widgets
([5630](https://github.com/jupyterlab/jupyterlab/pull/5630),
[5599](https://github.com/jupyterlab/jupyterlab/issues/5599))
- We have added a `jupyterlab/ui-components` package that contains
reusable React components to be used internally and in extensions.
Feel free to use this to create extension UIs with consistent styles
([5538](https://github.com/jupyterlab/jupyterlab/pull/5538))
- The `showErrorMessage` function now lets you customize the buttons
it uses
([5513](https://github.com/jupyterlab/jupyterlab/pull/5513))
- We now provide helpers for using React components within JupyterLab.
If you were previously using `ReactElementWidget` you should switch
to using `ReactWidget`.
([5479](https://github.com/jupyterlab/jupyterlab/pull/5479),
[5766](https://github.com/jupyterlab/jupyterlab/issues/5766),
[6595](https://github.com/jupyterlab/jupyterlab/pull/6595),
[6595](https://github.com/jupyterlab/jupyterlab/pull/6595))
- The share link command has been moved to its own extension so that
it can be overridden
([5460](https://github.com/jupyterlab/jupyterlab/pull/5460),
[5388](https://github.com/jupyterlab/jupyterlab/issues/5388))
- Creating a new services session now requires passing a kernel model
instead of a kernel instance
([6503](https://github.com/jupyterlab/jupyterlab/pull/6503),
[6142](https://github.com/jupyterlab/jupyterlab/issues/6142))
- We upgraded the Webpack raw file loader. The new version of the raw
loader exports ES2015 modules, so this may require changes in
extensions that import files using the raw loader. For example, if
you did `require('myfile.md')` to get the content of
`myfile.md` as a string, you now should import it using
ES2015 `import` syntax, or use
`require(\'myfile.md\').default`.
- Widget factories now can support custom cloning behavior from an
optional source widget
([6060](https://github.com/jupyterlab/jupyterlab/pull/6060),
[6044](https://github.com/jupyterlab/jupyterlab/issues/6044))
- We have renamed the type `InstanceTracker` to `WidgetTracker`
([6569](https://github.com/jupyterlab/jupyterlab/commit/da8e7bda5eebd22319f59e5abbaaa9917872a7e8)).
- In order to add widgets to the main area (e.g. as in the old XKCD
extension tutorial), the correct syntax is now
`app.shell.add(widget)` or `app.shell.add(widget, 'main')`, see
[here](https://github.com/jupyterlab/jupyterlab/blob/da8e7bda5eebd22319f59e5abbaaa9917872a7e8/packages/application/src/shell.ts#L500).