Bug 456153

Created attachment 150280 [details]
Broken preview with offset

SUMMARY
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STEPS TO REPRODUCE
1. Configure Icons-only Task Manager
2. Select Behaviour>Clicking grouped task>**Shows textual list**
3. Click on a grouped collection of windows

OBSERVED RESULT
4. Often (there is inconsistency) the width is wrong and so the preview does not show the window titles

EXPECTED RESULT
5. The width is correct and the window titles are shown

SOFTWARE/OS VERSIONS
Linux: 5.19.0-1-MANJARO
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5

ADDITIONAL INFORMATION
See attached image for how it looks when broken. Sometimes it is offset like this, sometimes it is centred.
When it is opened and is offset like this, there seems to be a flicker of the titles being correctly displayed (which presumably causes the centring to be based on that.)
Another symptom much less commonly seems to be the titles being displayed but the width of the box being too big, which occurs if a wider title was previously displayed.