Bug 383289

Summary:	Z fighting between plasma dialogs and highlighted window
Product:	[Plasma] kwin	Reporter:	Fabian Vogt <fabian>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	vlad.zahorodnii
Priority:	NOR
Version First Reported In:	5.10.4
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Fabian Vogt 2017-08-08 16:50:12 UTC

0. Enable window highlighting on hover
1. Open the system tray or the main menu
2. Hover over a window entry in the taskmanager

-> Z-fighting between the dialog and the highlighted window

Comment 1 Martin Flöser 2017-08-08 17:38:20 UTC

Z-fighting in this situation means? Constant switching?

Comment 2 Fabian Vogt 2017-08-08 17:41:49 UTC

(In reply to Martin Flöser from comment #1)
> Z-fighting in this situation means? Constant switching?

Flickering between the layers, yes. It's basically like opacity: rand(0, 1) on every redraw.

Comment 3 Vlad Zahorodnii 2018-07-12 12:54:32 UTC

KWin doesn't use depth buffer so that's not possible to have Z-fighting.
What do you mean by Z-fighting?

Comment 4 Fabian Vogt 2018-07-12 13:37:11 UTC

(In reply to Vlad Zagorodniy from comment #3)
> KWin doesn't use depth buffer so that's not possible to have Z-fighting.
> What do you mean by Z-fighting?

From what I can remember, it looked 100% like z fighting here.

I can't hightlight windows on wayland, so I can't reproduce the issue here unfortunately.

Comment 5 Vlad Zahorodnii 2018-08-25 16:08:05 UTC

KWin doesn't use depth buffer. Thus, that's not possible to have Z-fighting.

If you're still able to reproduce this bug, please reopen it.