Log Message:
xfce4-panel: update to 4.18.5

4.18.5 (2023-09-27)
======
- pager: Do not adapt upper value of spin button in viewport mode
- pager: Update workspace layout also on window manager change
- pager: Fix aspect ratio for viewport (V2)
- actions: Fix memory leak
- pager: Delay GdkScreen signal handlers
- panel: Do not scale background image when UI scale > 1
- popup-command: Do not block autohide when popped up at pointer
- Fix memory leaks when using gtk_css_provider_new()
- panel: Clear item list before repopulating item dialog
- panel: Remove autosave timer for plugins
- wrapper: Really ensure we don't call gtk_main_quit() twice
- panel: Block autohide when the panel has input focus
- clock: Fix sync timeout for seconds display
- clock: Implement ConsoleKit sleep monitor
- Add/Sharpen icons at 48-128px
- Adjust 32px icon margins, new separator icon
- Sharpen icons at 16px and 32px
- Increase margins for 24px icons
- Make 24px icons sharper
- icons: Fix wrong exported sizes
- Translation Updates:
  Basque, Catalan, Danish, Estonian, French, Italian, Kazakh, Polish,
  Russian, Slovenian, Spanish