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Bug#790825: libqt5widgets5: Crashing when waking up from suspend is not connected with VLC crashing bug



W dniu 11.02.2016 o 13:25, Vincent Lefevre pisze:

You need specific steps to reproduce the crash with VLC or the
example program written by Sebastian Ramacher, otherwise it is
not reproducible[*]. This may also depend on the window manager
or desktop environment. The fact that you do not notice crashes
with VLC does not mean that there are no bugs.

[*]https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=807528#48

I'm copying the steps here:

To reproduce the crash:
1. Run ./helloworld
2. Move to another desktop page (my window manager: fvwm).
3. Switch off the screen and switch it on again.
4. Move to the initial desktop page. At this point, the redraw of the
    helloworld window is not done (there is garbage from the previous
    desktop page).
5. Click on the helloworld window. This makes the program crash.

Note: same problem with the VLC window and the same steps.
I could not reproduce this. I have 2 external monitors connected to the laptop: DP1 and VGA1. - I run example program on VGA1. Then I try drag the "helloworld" window to DP1. - Kwin crashes when the window is passing from VGA1 to DP1 (helloword is OK). I run kwin manually. 
- Now I can drag helloword to DP1.
- I disconnect DP1 and connect it again. Helloword is OK.
- I try to drag it to VGA1. Kwin crashes again. I run it manually, now I can drag Helloworld to VGA1. - Helloword is OK - there is no garbage in the window I can click it or resize it.
I played more with it. I connected and disconnected monitors in different order, moved helloworld window between screens. Nothing happens to the helloworld. Kwin crashed > 10 times during this tries.
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