Bug 387895

Summary:	Window rules are not detected with some applications
Product:	[Plasma] kwin	Reporter:	Alberto Torres Ruiz <kungfoobar>
Component:	rules	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	normal
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Alberto Torres Ruiz 2017-12-14 11:27:55 UTC

Maybe some applications change window class after the window is created?

Steps to reproduce:

- Open Spotify.
- Add window rule with substring "potify".
- Set some change to see if the rule is affecting.
  (in my case, minimum size of 770x70)
- Restart Spotify. It no longer affects.

Related: Bug 387742 (and the reason I'm skipping the S)

KWin 5.9.4

Comment 1 Martin Flöser 2017-12-14 19:51:03 UTC

*** Bug 387742 has been marked as a duplicate of this bug. ***

Comment 2 Martin Flöser 2017-12-14 19:52:57 UTC

Spotify is not ICCCM compliant. It changes the class after mapping which is not allowed. See https://tronche.com/gui/x/icccm/sec-4.html#s-4.1.2.5

"This property must be present when the window leaves the Withdrawn state and may be changed only while the window is in the Withdrawn state."