https://bugs.kde.org/show_bug.cgi?id=356609

--- Comment #10 from Eike Hein <h...@kde.org> ---
> The task list does not show applications, but windows.

The task list shows tasks, not windows. Tasks are an abstraction built out of
data from different sources. One of those sources is windows, but the others
are launchers and startups notifications. Launchers and startup notification
use system theme icons for applications. These different things form a
lifecycle; a button morphs between launcher, startup notification and window.

Preferring it always means that:
- Icons don't change jarringly between states.
- Buttons always use the theme icon, meaning they change reliably when changing
the system icon theme, even if the application uses an incorrect mechanism to
load its icon assets (i.e. not using the system icon theme).

Both of these not being true lead to many, many user bug reports in the past.

Additionally, on Wayland there is currently no window icon. There's only an app
id, and the app id is used to find an icon, just like is now done on X11. That
means consistent behavior between the two supported windowing systems.

The code falls back to the window icon (on X11) as a last resort when an app
can't be identified (due to not being installed or being broken).

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