[xwaylandvideobridge] [Bug 524031] Window becomes fullscreen, invisible (opacity 0) and input-accepting, silently blocking all pointer input on one output

https://bugs.kde.org/show_bug.cgi?id=524031

--- Comment #5 from Adam <[email protected]> ---
Test to separate the window from the process, done while the failure was
active:

  xdotool windowunmap 0x1200008    -> pointer input restored immediately
  xdotool windowmap   0x1200008    -> input blocked again

The process was left running throughout, so it is the mapped window that
blocks input, not anything about the process being killed or the restack
that follows it.

Note that xdotool windowmove on this window is a no-op; the geometry stays
3840x2132+0+28 (the output work area) regardless, presumably clamped by
KWin. Unmap is what works.

Frequency has increased sharply: it now recurs every few hours rather than
every day or two. Seven occurrences so far, all cleared by removing the
window: killing the bridge six times, and the unmap test above once.

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