https://bugs.kde.org/show_bug.cgi?id=458929
Bug ID: 458929
Summary: Cursor stays hidden when gdb break point is triggered
using GLFW3
Product: kwin
Version: 5.25.4
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: input
Assignee: kwin-bugs-n...@kde.org
Reporter: abdulalze...@gmail.com
Target Milestone: ---
Created attachment 151951
--> https://bugs.kde.org/attachment.cgi?id=151951&action=edit
Minimal project to reproduce the bug
SUMMARY
When debugging a c/c++ project with gdb, if a break point is triggered in a
specific way, cursor will stay hidden even if the window loses focus. This
makes the user unable to use the mouse whenever a breakpoint is hit.
Essentially making debugging apps in plasma DE a nightmare.
I believe this is a kwin issue because if I understand correctly, kwin doesn't
let apps hide the cursor from all windows, just from the windows created from
host app's process.
The function for hiding the cursor from GLFW is
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
I tried producing a minimal example to reproduce the bug. It is a cmake project
attached to this issue. It might need some tinkering to make it work on your
setup, I'm using vs code, so I left the configuration files there in case it is
useful for anyone.
STEPS TO REPRODUCE
1. Install GLFW3 and download attached project
2. Generate CMake project with "cmake -DCMAKE_BUILD_TYPE=Debug ."
3. Place breakpoint on line 18 (end bracket) on main.c
4. Start debugging and exit the app(Alt + F4 for me), without making the window
lose focus
5. Break point is hit, app loses focus but cursor still doesn't show
OBSERVED RESULT
Cursor is hidden even when focusing other apps
EXPECTED RESULT
Cursor should be visible (shouldn't it?)
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Archlinux
KDE Plasma Version: 5.25.4
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
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