Bug 246622

Summary:	Maximised windows leave a line of desktop background above panel with compositing enabled
Product:	[Plasma] kwin	Reporter:	Ralf Jung <post>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	plasma-bugs
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Attachments:	A screenshot showing the issue (right half is with composite, left half without)

Description Ralf Jung 2010-08-03 17:20:40 UTC

Version:           unspecified (using KDE 4.4.2) 
OS:                Linux

With composite enabled, when I maximise a window, a 1 pixel line of the desktop background is visible between the panel and the window. When I disable composite, that line is coloured in the background colour of the panel, so that it is perceived as part of the panel.

Reproducible: Always

Steps to Reproduce:
Just enable compositing and maximize a window. The effect might be hard to notice on some desktop backgrounds though.

Actual Results:  
The window is one pixel too narrow in height, leaving one pixel of desktop background visible (or the panel reports its height one pixel too high).
I attached a screenshot showing the effect: The left half has compositing disabled, the right one has it enabled. You can clearly see the black line which is coming from the desktop background.

Expected Results:  
The lowest window pixel should be directly above the panel.

OS: Linux (x86_64) release 2.6.32-24-generic
Compiler: cc

I am using the default Plasma style.

Comment 1 Ralf Jung 2010-08-03 17:21:36 UTC

Created attachment 49782 [details]
A screenshot showing the issue (right half is with composite, left half without)

Comment 2 Thomas Lübking 2010-08-03 17:46:04 UTC

attaching plasma since this is (if not intended) likely a panel bug (mismatch between the set and the visual strut)

Comment 3 Martin Flöser 2010-08-26 21:32:55 UTC


*** This bug has been marked as a duplicate of bug 248570 ***