4.15.2

- panel: Improve autohide animation
- panel: Add "popdown-speed" property to adjust autohide animation
- panel: Fix autohide state machine
- panel: Fix cancellation of autohide animation
- panel: Immediately show panel in intellihide
- panel: Don't tamper with leave_opacity value (Bug #16296)
- launcher: Show desktop actions in context menu
- plugin: Show custom menu items below plugin name
- tasklist: Hide brackets for min windows by default
- tasklist: Fix crash middle-click-closing grouped windows (Bug #16410)
- systray: Basic support for symbolic icons
- systray: Silence deprecation warnings
- systray: Remove superfluous warning
- Improve wording in "Remove plugin" dialog (Bug #9000)
- settings: Add keywords for discoverability (Bug #10694)
- Fix GTimeVal deprecation (Bug #16643)
- Fix memory leak in panel plugin wrapper (Bug #16640)
- Update docstring
- Update libxfce4panel symbols
- Make var names more consistent
- Fix cast
- Fix typo
- Fix indentation
- Translation Updates:
  Albanian, Basque, Belarusian, Bulgarian, Catalan, Chinese (China),
  Chinese (Taiwan), Croatian, Danish, Dutch, Finnish, French, Galician,
  Georgian, German, Hebrew, Hungarian, Italian, Japanese, Kazakh,
  Lithuanian, Malay, Norwegian Bokmål, Polish, Portuguese, Portuguese
  (Brazil), Russian, Serbian, Slovenian, Spanish, Turkish, Ukrainian
This tag has no release notes.