Created attachment 186116 [details] gdb backtrace SUMMARY Unable to predictably reproduce. Also randomly observed on 5.2.11 and 5.2.13 version: krita-5.3.0-prealpha-c9c81e12c4-x86_64.Appimage Operating System: Kubuntu 24.04 KDE Plasma Version: 5.27.12 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.13 Kernel Version: 6.8.0-86-generic (64-bit) Graphics Platform: X11
Created attachment 186158 [details] backtrace (different crash event) Another crash when using keyboard shortcut
Created attachment 186159 [details] backtrace (different crash event)
The location of the safe assert is the same. It shouldn't be possible to trigger this assert with a release appimage. However, without more information it's going to be really hard to reproduce the issue even with nightly builds.
This bug is a consequence of a recent opacity switch patch. The opacity converter is switched on every tool switch. And it seems like something fails here. The tool switch happens with the tool shortcut. I would try to test if pressing tool shortcut while some other tool is doing and action could trigger the issue.