Created attachment 121985 [details] Icon in window decrations SUMMARY Some icon themes have replace certain app icons with better ones, but menu icon in window decorations doesn't follow that icon themes, thus still shows the ugly version. STEPS TO REPRODUCE 1. Install papirus icon theme and latte-dock 2. Apply papirus icon theme in systemsetting5 3. Check the icon of smplayer in both window decorations and latte-dock OBSERVED RESULT Icon in window decorations is still the ugly one. But task manager in the default panel or latte-dock all follow the icon theme to show a better icon. EXPECTED RESULT No matter whether it's icon menu in window descorations, or in the default panel or in latte-dock, all icons should follow the icon theme setting SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
Created attachment 121986 [details] Icon used in latte dock or task manager
This icon-theme-not-applied bug also affects alt-tab task-switchter "large icons" visualization.
Same issue and root cause as Bug 351055. *** This bug has been marked as a duplicate of bug 351055 ***