4.20.6 - arrow-fix: Restoring the button size after the arrow disappears - build: Fix typo in optimization level - wayland: Set plugins internal unless forced external - prefs-dialog: Reset add/remove buttons sensitivity when needed - wayland: Minimalist management of workspace group change when unused - pager: Add missing signal handler disconnections - I18n: Update po/LINGUAS list - libxfce4panel: Clarify doc - Translation Updates: Catalan, French, Korean, Slovenian, Tatar, Thai, Vietnamese