I encounter many issue with Gimp using a Wacom tablet. Moreover, I noticed that depending on the widget in the UI, a stylus (left) click works as expected, and sometimes I have to perform a down action. It means move out the surface and go down to click. When I click on a window icon on the task bar while on the surface, I got unexpected actions, sometimes it does a right click action. I also have Gremlins in my mouse (left) click. And I don't know if it is a hardware issue (mouse contact) or a bug. I also noticed a left mouse click reacting as a right click.
For Gimp V3 GTK3 issue, see https://gitlab.gnome.org/GNOME/gimp/-/issues/12678 OS is Fedora 41
This is most likely caused by https://bugs.kde.org/show_bug.cgi?id=499576
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/7563
Git commit e3e6af69c64fc15b3a7a2f3ffa493d2f7315d374 by Xaver Hugl. Committed on 05/05/2025 at 16:23. Pushed by zamundaaa into branch 'master'. input: set the current surface correctly for tablet events It ignored subsurfaces and always used the root surface of the window. Related: bug 499576 M +6 -6 src/input.cpp M +4 -21 src/wayland/seat.cpp M +11 -6 src/wayland/surface.cpp M +2 -0 src/wayland/surface.h https://invent.kde.org/plasma/kwin/-/commit/e3e6af69c64fc15b3a7a2f3ffa493d2f7315d374
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/7588
Git commit cbea602145d18760e70be264d54126a6ef7ee6e1 by Xaver Hugl. Committed on 05/05/2025 at 17:09. Pushed by zamundaaa into branch 'Plasma/6.3'. input: set the current surface correctly for tablet events It ignored subsurfaces and always used the root surface of the window. Related: bug 499576 (cherry picked from commit e3e6af69c64fc15b3a7a2f3ffa493d2f7315d374) M +6 -6 src/input.cpp M +4 -21 src/wayland/seat.cpp M +11 -6 src/wayland/surface.cpp M +2 -0 src/wayland/surface.h https://invent.kde.org/plasma/kwin/-/commit/cbea602145d18760e70be264d54126a6ef7ee6e1