SUMMARY If a theme doesn't support setting opacity options, the user is still not prevented from changing them in the panel configuration dialog. This is confusing because the options don't do anything. STEPS TO REPRODUCE 1. Switch to a theme like Oxygen 2. Go to the panel configuration window and try to change the opacity setting OBSERVED RESULT Clicking on the options does nothing and if you visit the dialog again you are defaulted back to translucent EXPECTED RESULT The combobox is disabled, preferably with a tooltip explaining why. SOFTWARE/OS VERSIONS Operating System: Manjaro Linux KDE Plasma Version: 6.6.80 KDE Frameworks Version: 6.24.0 Qt Version: 6.10.1 ADDITIONAL INFORMATION This is very likely what the misplaced line of code was supposed to do: https://bugs.kde.org/show_bug.cgi?id=515987 I'm submitting a patch in a few minutes.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/3542
Git commit c7fddd119b773cab677a55af6173079f4590dc28 by Nate Graham, on behalf of Filip Fila. Committed on 16/03/2026 at 21:47. Pushed by ngraham into branch 'master'. desktoppackage: Don't offer panel opacity settings if the theme doesn't support them Depends on plasma/libplasma!1441 If a theme doesn't support setting opacity options, the user is still not prevented from changing them in the panel configuration dialog. This is confusing because the options don't do anything. The runaway line of code from !3538 was probably meant to turn off the combobox if adaptive opacity is not supported. This patch disables the combobox in such cases, disables toggling the combobox by clicking on the thumbnail above, dims the combobox, and adds a tooltip that explains why the control is disabled. FIXED-IN: 6.7.0 M +20 -5 desktoppackage/contents/configuration/PanelConfiguration.qml https://invent.kde.org/plasma/plasma-desktop/-/commit/c7fddd119b773cab677a55af6173079f4590dc28