6.0.0

Added

Native notifications now have lower urgency if the display interval is less
than 10 seconds. This makes clipboard change notification less intrusive.
Preview dock can be focused with Tab key (#1826). Escape, Tab or Shift+Tab
returns focus back to the item list.
All options are now documented/described when using command copyq config.
Command editor now supports highlighting multi-line strings enclosed by
backticks (#1845).
New option to disable restoring window/dialog geometry (app needs to be
restarted after changing the option):
```
copyq config restore_geometry false
```
macOS: New option to enable native tray menu (#1652):
```
copyq config native_tray_menu true
```
Support for building the source code with Qt 6 framework.

While search bar is focused, pressing Down or PageDown key now selects next
item without focusing the item list (#1834).
Internal commands (like ""Show/hide main window", Pin/Unpin, Encrypt/Decrypt)
will now be automatically updated in following application releases or
whenever the language changes. The side-effect is that only icon, shortcuts,
enabled state and list order can be changed for these commands. Old internal
commands added in previous versions (5.0.0 and lower) of the app need to be
removed manually.
Increases the default delay for storing changed clipboard owner. This can
help save correct window title for new clipboard content when the window is
closed right after the copy operation. The delay can be changed using:
```
copyq config change_clipboard_owner_delay_ms 500
```
The application version now excludes the "v" prefix in UI and CLI.
Log Qt warnings by default (at Warning log level messages).
Linux: Other data formats are now stored for primary selection so as to
support some automatic commands properly (for example, ignore selection when
it contains a special format). Images and non-plain text formats are still
ignored for performance reasons.

Drag'n'drop operations are now properly ended (#1809).
Main window will now open only inside the visible screen area (#1768).
"Clear Current Tab" command will no longer show a message dialog if there are
pinned items (#1823).
Improves initial size for native tray menu.
Fixes removing backup file for old commands configuration.
Fixes broken item selection state (#1828).
Fixes hiding main window immediately when shown. This can be caused by long
animations in window manager.
Further performance improvements for logging, application startup and file
synchronization.
Linux: Native status icon (using D-Bus) is used by default instead of the
legacy tray icon. Application start delay/sleep hacks should no longer be
needed (#1526).
Wayland: Improved clipboard access.
Wayland: Fixes selection/clipboard synchronization.
Windows: Any application instance is now closed automatically before
installation.