Changing the window corner icon in plasma

[Teraflops]

I recently decided to try out a terminal Spotify client instead of the official app. I’m new to linux, so I decided it’d be a fun challenge to try and make it, so I still have a spotify taskbar icon, like with a regular app that just launches a separate terminal, with a different class, so it’s more easily distinguishable. I wrote a script that copied the spotify icons from the appropriate /usr/share/icons/hicolor/ subdirectories to ~/.local/share/icons/hicolor/, so I could uninstall spotify, without losing the icons. I managed to get the taskbar icon to work:

But the icon in the window corner is still the wayland logo:

I was curious what determines what exactly is displayed there? For reference, here is the .desktop file I made for this:

[Desktop Entry]
Categories=AudioVideo;Music;Player;
Comment=Terminal-based Spotify Client
Exec=ghostty --class=com.spotify.player --title=Spotify -e spotify_player
Icon=spotify-player
Name=Spotify
NoDisplay=false
StartupNotify=true
StartupWMClass=com.spotify.player
Terminal=false
Type=Application
WMClass=com.spotify.player
X-KDE-SubstituteUID=false

[johnandmegh]

Hi! For what it’s worth - I don’t know the underlying logic, but a “quick fix” for that is possible using KWin Window Rules. Here’s an example of a rule I use for a similar situation with Calibre, where the Desktop file name is the name of the .desktop file, minus the .desktop part

Using the “Detect Window Properties” button there can help identify what window class is actually present in the window you want to change, too.

[Teraflops]

Thanks, that solved the issue!