Changes
* Introduced a new design utilizing header bars (to use the old design, uncheck Menu -> View -> Use Header Bar)
* Improved UI responsiveness when scanning shares
* Improved UI performance when multiple tabs are open
* Added transfer statistics dialog
* Added help window for keyboard shortcuts
* Added an option to set a global font
* Added support for text completion when typing in the search entry
* Added a "Browse Folder" option for search results
* Search results can now be filtered by file type
* Added an option to clear search and filter history
* Columns can now be reordered by dragging them to the desired location
* Context menus for tabs now include an option to close all tabs
* Added context menu items for viewing and deleting logs (chatrooms, private chat, log pane)
* Added a keyboard shortcut to close tabs (Ctrl+W / Alt+F4)
* Context menus can now be opened by long-pressing on a touch screen
* Context menus can now be opened with the keyboard (Menu Key / Shift+F10)
* The number of selected files is now visible in context menus
* Added an option to copy the file path of a selected file using Ctrl+C
* Added file properties dialog for user browse
* Improved the default color scheme
* Several other minor improvements
Corrections
* Fixed an issue where upload speed limits were not applied on startup
* Fixed an issue where UPnP portforwarding did not succeed with certain routers
* Fixed an issue where enabling the geographical paranoia option would prevent search results from being delivered to others
* Fixed issues where certain uploads would be stuck in a "Cancelled" state
* Fixed a Windows-specific issue where the config file did not always save
* Fixed an macOS-specific issue where opening a folder did not work
* Fixed an issue where custom commands registered in plugins did not work
* Several other minor corrections
Issues closed on GitHub
* Nicotine will not login to server ([904](https://github.com/nicotine-plus/nicotine-plus/issues/904))
* File not shared ! ([905](https://github.com/nicotine-plus/nicotine-plus/issues/905))
* Backup of the slide position in the user browse tab ([908](https://github.com/nicotine-plus/nicotine-plus/issues/908))
* Save share list to disk => user tab ([909](https://github.com/nicotine-plus/nicotine-plus/issues/909))
* Double-clicking on shares ([917](https://github.com/nicotine-plus/nicotine-plus/issues/917))
* Fix viewing of shared files ([919](https://github.com/nicotine-plus/nicotine-plus/issues/919))
* WinError 3, "the system cannot find the path specified" ([920](https://github.com/nicotine-plus/nicotine-plus/issues/920))
* Replace usage of GtkComboBox with GtkComboBoxText ([921](https://github.com/nicotine-plus/nicotine-plus/issues/921))
* nicotine-plus.org certificate expired ([922](https://github.com/nicotine-plus/nicotine-plus/issues/922))
* Cyrillic characters don't display correctly in chat rooms (Unicode issue?) ([925](https://github.com/nicotine-plus/nicotine-plus/issues/925))
* Log windows scroll back to begin after any new entry. ([926](https://github.com/nicotine-plus/nicotine-plus/issues/926))
* Config resetting when quitting and opening again ([934](https://github.com/nicotine-plus/nicotine-plus/issues/934))
* nicotine.po ([936](https://github.com/nicotine-plus/nicotine-plus/issues/936))
* Bug: Browsing your own shares with "Share only to buddies" enabled isn't possible via User browse ([940](https://github.com/nicotine-plus/nicotine-plus/issues/940))
* Bug: Displayed shared files count in Chat rooms / User info inconsistent ([941](https://github.com/nicotine-plus/nicotine-plus/issues/941))
* Feature Request: Clear filters button ([944](https://github.com/nicotine-plus/nicotine-plus/issues/944))
* Feature Request: Allow regular expressions in Country field of Search Filters ([946](https://github.com/nicotine-plus/nicotine-plus/issues/946))
* Config Bug: WinError 32 + WinError 2: Can't rename config file, error & The system cannot find the file specified ([949](https://github.com/nicotine-plus/nicotine-plus/issues/949))
* Feature Request: Clear Search Result Filter History ([950](https://github.com/nicotine-plus/nicotine-plus/issues/950))
* Feature Request: A method to quit via Tray Icon ([951](https://github.com/nicotine-plus/nicotine-plus/issues/951))
* Windows Bug: Can't bring Nicotine+ to the foreground if one of its popup windows are open ([953](https://github.com/nicotine-plus/nicotine-plus/issues/953))
* Windows Bug: Preferences popup window is slow to open on occasion ([954](https://github.com/nicotine-plus/nicotine-plus/issues/954))
* Now Playing ([957](https://github.com/nicotine-plus/nicotine-plus/issues/957))
* Filtering by "10m" gives files >=10MiB, but filtering "10MiB" gives files >=9.54MiB ([961](https://github.com/nicotine-plus/nicotine-plus/issues/961))
* Setting Plugin /commands ([962](https://github.com/nicotine-plus/nicotine-plus/issues/962))
* Feature Request: Search Wishlist: Change "Select All" Button to "Clear All" ([963](https://github.com/nicotine-plus/nicotine-plus/issues/963))
* Feature Request: Indication that a search tab was opened automatically by the wishlist ([964](https://github.com/nicotine-plus/nicotine-plus/issues/964))
* Feature Request: Option to choose the search result filter's tab bar position ([965](https://github.com/nicotine-plus/nicotine-plus/issues/965))
* Bug: Clearing all active filters requires double-Enter for next filter attempt ([966](https://github.com/nicotine-plus/nicotine-plus/issues/966))
* MacOS 11.1 Open folder fails ([970](https://github.com/nicotine-plus/nicotine-plus/issues/970))
* MacOS 11.1, open folder opens the wrong directory ([971](https://github.com/nicotine-plus/nicotine-plus/issues/971))
* MacOS 11.1, wrong flag in buddy list ([972](https://github.com/nicotine-plus/nicotine-plus/issues/972))
* New bundled UPnP is not working ([973](https://github.com/nicotine-plus/nicotine-plus/issues/973))
* Replace GtkFileChooserButton with a custom button widget ([975](https://github.com/nicotine-plus/nicotine-plus/issues/975))
* Windows: Toggle show / minimize app on taskbar icon click ([976](https://github.com/nicotine-plus/nicotine-plus/issues/976))
* Feature Request: Enable tooltips for long strings that are cut off by another column ([977](https://github.com/nicotine-plus/nicotine-plus/issues/977))
* What is causing the log "Filtered out inexact or incorrect search result ... from user X"? ([979](https://github.com/nicotine-plus/nicotine-plus/issues/979))
* Bug: Private chat tabs closed/discarded without manually doing so ([983](https://github.com/nicotine-plus/nicotine-plus/issues/983))
* Bug: Unable to reliably close search tabs via middle mouse button click ([984](https://github.com/nicotine-plus/nicotine-plus/issues/984))
* Feature Request: Log Viewer / Context menu items to browse logs in system text editor ([986](https://github.com/nicotine-plus/nicotine-plus/issues/986))
* Failure to report buddy shares ([988](https://github.com/nicotine-plus/nicotine-plus/issues/988))