Bug 495754

Created attachment 175491 [details]
Tray icons, with missing icons indicated via red boxes.

SUMMARY

In the last week or so, a regression has been introduced that causes a very few apps to fail to render their system tray icons.

STEPS TO REPRODUCE
1. Use kde-builder to build workspace from latest source.
2.  Install the current version of one of the affected apps.  There may be more, but here are two I've noticed:
      - Steam
      - Betterbird
3. Notice that the tray icons are blank.

OBSERVED RESULT

   There are gaps where the application icons would be:  https://i.imgur.com/YM85oTH.png

   If you hover over them, you can still access them and their context menus, but the icons are never drawn.

   There don't appear to be any errors logged when I run the apps from the console.

EXPECTED RESULT

   Until the last week, all apps were drawing their icons normally.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.3 Dev
KDE Plasma Version: 6.2.80
KDE Frameworks Version: 6.9.0
Qt Version: 6.7.3

ADDITIONAL INFORMATION
   - Tested with X11.
   - nVidia 560.35.03 video drivers w/RTX 2070 Super.
   - Ubuntu Plucky Puffin (devel repos) base with plasma built from source (tested with --refresh-build; same results).  Same system/build process I've been using successfully for months.
   - Tested with multiple themes/icon sets; same results.
   - No other plasma issues - just these couple of missing icons for specific apps.