[Bug 850628]

[Alexander Mezin]

(In reply to comment #202)
> It will  require to move the blocking code from Client to Toplevel - does
> anything but (upcoming) SDL2 support it so far?
AFAIK, almost every new game is using SDL 2 (from games based on MonoGame to Valve's Source). And most old games are using SDL 1, which does override_redirect. I say "most" and "almost" here, but I don't know any exceptions.

> The _NET_WM_BYPASS_COMPOSITOR tristate is a red herring: if special clients
> are not interested in saying: "1", why should regular clients be interested
> in saying "2"?
Regular clients don't need to say anything, they won't be unredirected/compositing won't be suspended.

> And why esp. those which are override_redirect and thus often don't set any
> properties at all?
You answered yourself:
> The next problem is that unmanged windows are only matched "fullscreen" by
> their geometry, so if your imagebrowser opens a popup to preview the image
> and uses the maximum screen area, you'll toggle compositing by it.
It's not too hard to set this hint, 3 lines of code with Xlib or a bit more with xcb.
Also, as Gnome's Mutter does almost the same things (in particular, it unredirects unmanaged windows), non-KDE clients will have this hint where needed.

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https://bugs.launchpad.net/bugs/850628

Title:
  When the Euphoria (GL) Screensaver starts, KWIN crashes

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