Retext

* Dependency changes:
- Python ≥ 3.6 is now required.
- Qt and PyQt ≥ 5.11 are now required.
* General improvements:
- Added ability to show a side panel with directory tree (contributed by
Xavier Gouchet in 531).
- Added support for searching in the preview mode.
- When some text is selected and a quote, bracket or emphasis key is
pressed, the text is surrounded rather than replaced (contributed by
Daniel Venturini in 520).
- Added an option to fully highlight wrapped lines (contributed by
nihillum in 523).
- Improved current line highlighting for right-to-left text layout.
- Ordered list behavior can now be configured to repeat or increment the
list item number (contributed by Binokkio in 527).
- Added mnemonics to open the menus from keyboard (contributed by David
Hebbeker in 528).
- Added Apply button to the Preferences dialog (contributed by Amos Kong
in 543).
- Removed use of deprecated Python, Python-Markdown, Qt and PyQt API.
* Bugs fixed:
- Issue 507 — Improved the error message when trying to build ReText as a
wheel package.
- Issue 529 — Markup that intersects with code blocks is no longer
highlighted.
- PR 530 — Preview is no longer updated when it is not shown (contributed
by rhn in 530).
- Issue 533 — Fixed showing local images with Qt WebEngine 5.15.
* Translations updated:
- Arabic (contributed by ZamanOof).
- Chinese (China) (contributed by liulitchi).
- Dutch (contributed by Heimen Stoffels).
- Japanese (contributed by YAMADA Shinichirou).
- Persian (contributed by Hadi F).
- Polish (contributed by Maciej Haudek).
- Russian.
- Spanish (contributed by Félix Fischer).
- Swedish (contributed by Philip Andersen).

* General improvements:
- New files are now opened in new tabs by default, not new windows
(contributed by Daniele Scasciafratte in 476). This can be disabled
using `openFilesInExistingWindow` configuration option.
- Preferences dialog improvements: it now uses tabs; added a link to
configuration file (contributed by Xavier Gouchet in 327); clicking on
checkbox label now changes checkbox state.
- Return key now automatically continues quote blocks and ordered lists
(contributed by Xavier Gouchet in 298 and 326).
- It is now possible to close the current tab with Ctrl+W (contributed by
Xavier Gouchet in 283).
- Ctrl+wheel on editor now increases/decreases font size (contributed by
Xavier Gouchet in 328). Ctrl+wheel in preview zooms in/out (400).
- Alt+Up/Down arrow now moves the current line up/down (contributed by
Xavier Gouchet in 337).
- Added “Jump to Line” feature, with Ctrl+G shortcut (contributed by
Xavier Gouchet in 382).
- Table mode improvements (contributed by Maurice van der Pot).
- “Paste Image” moved to a separate action, with Ctrl+Shift+V shortcut.
- Added “Insert table” dialog (contributed by Changhee Kim in 431).
- Clicking a link to nonexistent file now prompts the user to create it
(contributed by red-kite in 436 and Xavier Gouchet in 459).
- Added a menu action to insert images from filesystem (contributed by
Daniel Venturini in 500).
* New options added:
- `relativeLineNumbers` — count line numbers as relative to the current
line (contributed by Xavier Gouchet in 270).
- `documentStatsEnabled` — show text statistics in the lower left corner
of the editor (contributed by Xavier Gouchet in 268 and 338).
- `rightMarginWrap` — soft-wrap text at user specified margin line
(contributed by Oğuzhan Öğreden in 313).
- `paperSize` — set the default paper size for print or PDF export
(contributed by mray271 in 335).
- `recentDocumentsCount` — number of recent files to show in the menu
(contributed by red-kite in 407).
- `windowTitleFullPath` — show full path in window title (contributed by
red-kite in 429).
- `defaultPreviewState` — mode for new tabs: `editor`, `normal-preview` or
`live-preview` (contributed by red-kite in 435). It replaces the old
`livePreviewByDefault` option.
- `wideCursor` — make cursor as wide as characters.
* Bugs fixed:
- Issue 252 — Limit max-width of images to 100%.
- Issue 267 — setup.py now installs retext.svg icon.
- Issues 281, 469 — Autofill current filename for PDF export and Save As
dialogs (the Save As part contributed by Xavier Gouchet in 474).
- Issue 291 — Make sure search result does not overlap with stats/info
areas.
- Issue 301 — Made the Markdown include extension working.
- PR 315 — Fixed handling multi-line rows in reStructuredText tables in
table mode (contributed by R1dO).
- Issue 346 — Ctrl+F now focuses the search field, not closes the search
bar. To close the search bar, now the Escape key can be used.
- Issue 378 — Ensure that cursor is visible after resizes.
- Issue 397 — Only check whether .css file exists on initial page load.
- Issue 399 — Try to load libGL.so.1 before creating QApplication.
- Issue 408 — Fix printing with dark themes.
- Issue 409 — Make the WebKit renderer use disk cache.
- PRs 411, 417, 426, 494 — AppData file improvements (contributed by
scx).
- Issue 441 — Files reloading no longer triggers tab change.
- Issue 445 — Implemented PDF export for the WebEngine renderer.
- Issue 451 — Make the synchronized scroll implementation not break the
pymdownx.highlight extension.
- Issues 452, 497, 499 — Prevent pip from building wheels, as that
results in broken desktop files.
- Issues 467, 488 — WebEngine renderer broken with new Qt versions.
- Issue 468 — Include the stylesheet in exported HTML.
- Issue 479 — Display `*` in tab title when document is modified and
unsaved (contributed by Xavier Gouchet in 480).
- Issue 487 — Added a workaround for missing icons in Ubuntu 19.10 Yaru
theme.
- PR 496 — Enable HiDPI icons (contributed by Guo Yunhe).
* Translations updated:
- Chinese (China) (contributed by liulitchi and the Chinese team).
- Czech (contributed by David Kolibáč).
- Danish (contributed by scootergrisen).
- Dutch (contributed by Heimen Stoffels).
- Finnish (contributed by elguitar).
- German (contributed by Oliver A. Gubler in 370, Carsten Beck).
- Italian (contributed by Alessandro Menti).
- Korean (contributed by MukKim in 415).
- Portuguese (Brazil) (contributed by EdemarSantos).
- Portuguese (European) (contributed by Ricardo Simões in 278).
- Russian (contributed by Vladislav Glinsky, Виктор Ерухин).
- Serbian (contributed by Slobodan Simić).
- Spanish (contributed by Félix Fischer, Fito JB).
- Swedish (contributed by Philip Andersen).
- Ukrainian (contributed by Vladislav Glinsky).

* It is now possible to install ReText on Windows and macOS using a simple
`pip install ReText` command. This will pull PyQt5 wheels from PyPI,
and also download and extract the icons pack needed on this platforms.
Setup now also generates a wrapper batch script (this was contributed by
Hong-She Liang).
* Added experimental Qt WebEngine renderer, in addition to the existing
Qt WebKit one.
* The highlighter got support for reStructuredText links, field lists
and for Markdown and reStructuredText code spans.
* The replace option was added to the search toolbar.
* The WebKit and WebEngine previewers can now detect links to local HTML
files and open the corresponding source files in new tab if those are
found.
* The table mode is now able to insert inter-cell line breaks and new rows,
when Return and Shift-Return are pressed (respectively).
* ReText can now automatically detect files encoding when `chardet` module
is present (contributed by Hong-She Liang).
* A configuration option for automatically opening last files was added
(contributed by Hong-She Liang).
* A configuration option for hiding the tabs bar when there is only one tab
was added.

*Bugfix update 7.0.1 was released on 2017-06-25 with improved installation
procedure in setup.py, some crash fixes, and updated translations.*

*Bugfix update 7.0.2 was released on 2018-06-05, fixing many bugs. Most
importantly, issues with installation (324, 363, 365), with synchronized
scrolling breaking code blocks highlighting (299), with emoji support
(357, 368), and with some lines disappearing after opening files (345).*

*Bugfix update 7.0.3 was released on 2018-06-06 with minor changes and
fixed tarball contents.*

*Bugfix update 7.0.4 was released on 2018-09-23 with improved editor
performance (360), fixed crash on Windows when pasting images (385),
support for Python-Markdown 3.0, and updated translations.*

* The live preview now automatically scrolls to match its position with the
editor (only for Markdown).
* Markup conversion is now performed in a background process, improving
responsiveness of the editor.
* Images can now be copied and pasted into ReText (contributed by Bart
Clephas).
* Added a button to quickly close the search bar.
* Added basic CSS styling for tables.
* Replaced the tags box with the new “Formatting” box for Markdown
(contributed by Donato Marrazzo).
* Hitting return twice now ends the Markdown list.
* ReText now depends on version 2.0 or higher of pymarkups.
* The QtWebKit dependency is now optional (though still recommended).

*Bugfix update 6.0.1 was released on 2016-06-25, fixing some crashes and
making auto-save work again.*

*Bugfix update 6.0.2 was released on 2016-10-03, fixing an issue with
startup on Plasma and adding some new translations.*

* Tabs are now reorderable.
* All colors used in editor and highlighter are now configurable via the
configuration file.
* Links referencing other source files are now opened in ReText as new tabs
(feature contributed by Jan Korte).
* Code refactoring: some code moved to the new tab.py module, and some old
hacks dropped.
* The ReText logo is now installed to the data directory.
* Appstream metadata updated to a newer format.
* The desktop file no longer hardcodes the executable path (fix contributed
by Buo-Ren Lin).

* ReText now tries to load the icon theme from system settings if
Qt cannot auto-detect it.
* Added a GUI option to change the editor font.
* Added appdata file for appstream.