Cover image description
A screenshot showing an application switch with three open apps: system settings, Spotify and Firefox. The icon of the Spotify entry is highlighted and clearly wrong. Only the label "Spotify" gives away, that it's actually the app. The icon is the X11 fallback icon.
Applying a KWin Rule
Whether I installed the app image or the Flatpack version of Spotify, I always had issues with the app icon in the window's title bar and the application switch. It fell back to a defaulting x11 icon.
After investigating, it turned out that it's relatively easy to fix. All you need is a simple KWin rule. You don't even need to set any properties with it (at least, I have observed so far). It just needs to be there. For the sake of "better safe than sorry", we add a meaningful property anyway.
Open up "Window Rules" in the "System Settings". Add a new rule and give it a meaningful description. Something like "Spotify" should do the trick. Then add spotify (lowercase is essential!) as the Window Class. Afterward, click "Add Property" and choose "Desktop file name". Add spotify-client as the value and select the mode Force.
That's it already! Applying the changes should fix the icon.
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