https://bugs.kde.org/show_bug.cgi?id=466334
Bug ID: 466334
Summary: When panel opacity is "adaptive", there's delay
between virtual desktop switching and Icon manager
updates
Classification: Plasma
Product: plasmashell
Version: 5.27.0
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: Panel
Assignee: plasma-b...@kde.org
Reporter: ad.liu....@gmail.com
CC: niccolo.venera...@gmail.com
Target Milestone: 1.0
SUMMARY
When panel opacity is set to "adaptive", and desktop 1 has a window touching
the panel (panel is opaque), desktop has no window touching the panel (panel is
translucent), then when switching between these desktops, Icon Task Manager
updates about PlasmaCore.Units.longDuration (200ms) later after the desktop
switch.
Worse, when both desktops have a window touching the panel (panel is opaque in
both desktops), task manager updates about 2*PlasmaCore.Units.longDuration
(400ms) later after the desktop switch.
When both desktops have no window touching the panel (panel is translucent in
both desktops), there's no such delay.
Also, when panel opacity is set to "opaque" or "translucent", there's no such
delay.
STEPS TO REPRODUCE
1. Edit panel, set opacity to "adaptive".
2. Create 2 virtual desktops.
3. In desktop 1, maximize a window.
4. In desktop 2, minimize all windows.
5. Switch between desktops. Notice the delay between desktop switching and task
manager updating.
6. In desktop 2, maximize a window.
7. Switch between desktops. Notice the even longer delay between desktop
switching and task manager updating.
8. In both desktops, minimize all windows.
9. Switch between desktops. Notice no such delay.
10. Set panel opacity to "opaque" or "translucent".
11. Repeat step 1-9. Notice no such delay.
EXPECTED RESULT
Task manager updates the same time as virtual desktop switches, regardless of
panel opacity setting.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.27.1
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
The relevent code:
plasma-desktop/desktoppackage/contents/views/Panel.qml
line 120, line 185
Seems that:
1. Task Manager updates after the opacity animation, thus the delay.
2. When panel is opaque in both desktops, the opacity animation somehow runs
twice (although not visible), thus twice the delay.
It can be fixed by letting Task Manager (and other applets) updates before the
opacity animation, but I don't know how.
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