https://bugs.kde.org/show_bug.cgi?id=504750

--- Comment #10 from Robin Bankhead <[email protected]> ---
Created attachment 186039
  --> https://bugs.kde.org/attachment.cgi?id=186039&action=edit
console debug output, labwc - kwin_wayland - konsole

Attached output from running the same test command as above, this time inside a
SDDM-launched labwc session. Synopsis:
1. Ran test command from Foot terminal app with its window set to "Always on
top" in labwc. kwin_wayland window opens ovelapping foot window.
2. Typed "exit<ENTER>". No redraw of kwin_wayland window.
3. Focused foot window with mouse. kwin_wayland redraws, showing konsole
exited.
4. Closed kwin_wayland window (traversing its area with mouse to do so).
No stopwatch this time but can do that if it helps.

Regarding es2gears_wayland: I did experiment with this first, but it did not by
itself trigger redraws of the kwin_wayland window, even when positioned on top
of that window and set Always On Top by the WM. The same is true with foot,
when I ran the test command without redirection (so there was constant
redrawing in foot as the debug output spewed).

On the other hand, anything redrawing the area over the kwin_wayland window at
the WM level, e.g. hovering the 'Minimise' button on the overlapping window,
did trigger a redraw.

Notably, unlike in the previous testing with cage, here there were no redraws
at all, from the very outset, until a triggering action was taken. Mouse
movement by itself had no effect either way. (Mind you a multi-window
compositor in place of cage running kwin_wayland fullscreen is presumably bound
to have differences like this.)

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