Xfce Panel 4.16 Roadmap

General

Add dark theme switch in Appearance tab: DONE
Auto-hide animation (fade-out or move-out): DONE
Drop support for Gtk2 plugins and drop all related code: DONE
Fix border drawing to not only draw one outer border, but panels with <100% width should also have a left and right border: DONE
Switch to xfce_gtk_image_menu_item (libxfce4ui 4.15.2)

Fix xfce_panel_plugin_position_menu (or deprecate it)
Re-introduce xfce_panel_image in plugins and improve it (use GIcon or icon_name instead of always pixbuf), see https://bugzilla.xfce.org/show_bug.cgi?id=15888

Consider adding it to the panel as an internal plugin, merging it with the systray plugin to make the situation less confusing for users (the options for both plugins are pretty much the same). DONE (https://gitlab.xfce.org/xfce/xfce4-panel/-/merge_requests/4)

Add support for Desktop Actions on right-click context menus instead of submenus (maybe better to do this in garcon)

Improve theming (see grouping indicators for dark/bright bg decisions plus stackoverflow)
Ensure workspace wrapping when scrolling is the same as general workspace wrapping (possibly offer a setting in the properties dialog) - currently we ignore wnck wrapping
Add more options to workspace cycling (including disabling it, if libwnck allows for that)
Improve settings dialog (only show scrolling options when they apply, i.e. with the buttons): DONE
Add option to show workspace numbering on buttons: DONE

Move grouping options to a separate - dynamically added - tab
Offer more options (hide group indicator, possibly re-add text style)
Add option to keep mouse-wheel cycling within the group (so you switch between the windows of one application only) - or adjust the cycling logic to prioritize groups