Bug 342121

Summary: Xinerama actions (screen add or remove) resizes shuttered up windows spontaneously
Product: [Plasma] kwin Reporter: Hans-Peter Jansen <hpj>
Component: coreAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal    
Priority: NOR    
Version First Reported In: 4.11.12   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
See Also: https://bugs.kde.org/show_bug.cgi?id=161325
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Hans-Peter Jansen 2014-12-22 11:18:49 UTC 
I'm attaching a second screen to my desktop, that resizes the desktop. During that action, shuttered up windows are resized to a very small size. This happens mostly with okular and dolphin windows here, but those are the ones, where I use the shutter function most often.

Reproducible: Always

Steps to Reproduce:
1. Enable shuttered windows
2. Shutter up some dolphin windows 
3. Add a screen during the session

Actual Results:  
Windows are resized spontaneously

Expected Results:  
Windows keep their sizes

I observed this with radeon, nvidia, and nouveau setups, therefor I expect some (timing?) related issue, where adding a secondary screen changes the desktop size of the main screen (the one, where the session started).

It looks like the desktop resize is done as: remove main desktop area, add main+secondary area, and kwin chimes in in between and tries to resize windows to the minimum size. If that is the problem, kwin should delay the resize until xinerama operations are settled.
Comment 1 Thomas Lübking 2014-12-22 13:29:51 UTC 
The action actually is delayed, but that doesn't necessarily cut it.
Might be related to bug #161325, thus https://git.reviewboard.kde.org/r/121320/
Can you compile that patch and see whether it fixes your condition?
Comment 2 Martin Flöser 2015-01-14 08:26:14 UTC 

*** This bug has been marked as a duplicate of bug 161325 ***