https://bugs.kde.org/show_bug.cgi?id=368164
Bug ID: 368164
Summary: Background contrast effect causes panel flickering and
composition restarts while browsing through mails in
KMail
Product: kwin
Version: 5.7.3
Platform: Gentoo Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: ua_bugz_...@binary-island.eu
While browsing through mails in KMail, the composition is being restarted every
few seconds and with each mail jump, the panel flickers.
This took me quite a while to figure out, since it is not so obvious (@Thomas
Lübking: you gonna like this one): It is the background contrast effect. As
soon as it is off, everything behaves just fine.
This bug has been around a bit since I haven't used KMail for who knows long
and just am about to switch back. I remember I saw this exact behavior the last
time I tried KMail (which was already on Qt5 back then, but unfortunately I
don't know when that was).
Reproducible: Always
Steps to Reproduce:
1. Make sure composition as well as background contrast effect is on
2. Open KMail in a folder with quite a few mails
3. Browse through those mails with n and p in a pace that still shows the
individual mails
Actual Results:
With each mail shown, the panel will flicker. After a few mails, the
composition will restart with the typical msg that something requested that
action and the inherent screen side-effects.
Expected Results:
No flickering. No composition restarts.
KDE Applications 16.08, Frameworks 5.25.0, Plasma 5.7.4, NVIDIA Drivers 370.23
(GTX 1080)
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