This bug was fixed upstream per https://bugs.kde.org/show_bug.cgi?id=512005. The patch is https://invent.kde.org/plasma/libplasma/-/commit/85269ffd3b602ddf8c447ea283f4e7c10c4b4562.
I have tested the patch with Kubuntu 26.04 with the following packages replaced and have confirmed the following: WITH PATCH Six themes with embedded widgets would NOT show the panel when applied with [x] Appearance settings` AND `[x] Desktop and windows layout` in a VM, on an Intel System with a GPU (i9-14900HX / RTX 4060), and an Intel Arrow Lake (U7 255H). It did however, work on a Ultra X7 358H system. WITHOUT PATCH All six themes were applied twice on a VM and the panel and widgets were shown each time as expected. After 12 cycles, there were no errors and the panel showed every time. Two themes without widgets (kubuntu, breeze) were also tried and they both worked correctly also. All six themes were applied three times each on a the 358H system, and the panel and widgets were shown each time as expected. However, there was one "PlasmaShell Crash" on one application (out of 18 checks), but the desktop quickly recovered (<3s) and recovery was unobtrusive. This was on the first use of changing the theme, so this may be a one-time issue. These without widgets also worked correctly. ASSESSMENT This patch is very small and likely very low risk. Our company (KFocus.org) have multiple development systems currently running with the patch and are going through acceptance tests. I will add a comment once those are complete. ** Bug watch added: KDE Bug Tracking System #512005 https://bugs.kde.org/show_bug.cgi?id=512005 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2153448 Title: Layout use of addWidget nullifies defined panel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libplasma/+bug/2153448/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
