https://bugs.kde.org/show_bug.cgi?id=434115
Bug ID: 434115
Summary: Flickering of right-click popup menus with multiple
simultaneously highlighted entries in Thunderbird on
Wayland in Plasma
Product: kwin
Version: 5.21.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: matthew.fagn...@utoronto.ca
Target Milestone: ---
SUMMARY
The menus shown when right-clicking on an email item in a list of emails in
Thunderbird 78.8.0 and earlier on Wayland flickered and had multiple
simultaneously highlighted items when moving the cursor up and down them in
Plasma 5.21.2 and earlier in Fedora 34. This problem occurred in Thunderbird
78.8.0 on Wayland with OpenGL, WebRender, and in Safe mode with Basic
compositing. Thunderbird on X hasn't had this problem with the same versions.
The underlying issue might be in kwin_wayland. I haven't been able to reproduce
this problem in Thunderbird 78.8.0 on Wayland in GNOME 40 beta on Wayland in
Fedora 34.
STEPS TO REPRODUCE
1. Boot a Fedora 34 KDE Plasma installation updated to 2021-3-7 with the
updates-testing repo enabled
2. Log in to Plasma 5.21.2 on Wayland
3. Start Thunderbird on Wayland
MOZ_ENABLE_WAYLAND=1 thunderbird
4. right-click on an email in a list of emails in a folder
5. move the cursor up and down the right-click menu
6. If the flickering didn't happen, repeat 4-5 until it does
OBSERVED RESULT
Flickering of right-click popup menus with multiple simultaneously highlighted
entries in Thunderbird on Wayland in Plasma
EXPECTED RESULT
The right-click menus would appear normally without flickering, and only the
menu item under the cursor would be highlighted.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 34
(available in About System)
KDE Plasma Version: 5.21.2
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I reported the same problem of flickering and multiple highlighted items with
right-click menus in Firefox Nighly 81.0a1 (2020-8-21) on Wayland in Plasma
5.19.4 in Fedora 33 at https://bugzilla.mozilla.org/show_bug.cgi?id=1660567 I
haven't been seeing this problem in Firefox Nightly 86.0a1 (2021-1-15) - 88.0a1
(2021-3-6) and 86.0 on Wayland with WebRender enabled in Fedora 34 with Plasma
5.21.2 and earlier due to the menu items under the cursor not usually being
highlighted as I reported at
https://bugzilla.mozilla.org/show_bug.cgi?id=1693472 Since Firefox and
Thunderbird are based on the same rendering engine, the problems are likely
related.
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