| Summary: | Cursor stays hidden when gdb break point is triggered using GLFW3 | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Abdul <abdulalzeidi> |
| Component: | libinput | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED NOT A BUG | ||
| Severity: | normal | ||
| Priority: | NOR | ||
| Version First Reported In: | 5.25.4 | ||
| Target Milestone: | --- | ||
| Platform: | Arch Linux | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed/Implemented In: | ||
| Sentry Crash Report: | |||
| Attachments: | Minimal project to reproduce the bug | ||
> 5. Break point is hit, app loses focus but cursor still doesn't show
The attached demo hides the cursor and it appears like it creates a pointer constraint so the pointer can't escape the window. When you hit Alt+F4, kwin politely asks your demo to close the window, the demo receives that "polite" request and quits the while loop. Note that during that whole time, the pointer constraint is still active as "return 0" has not been executed so no surface has been destroyed and kwin continues to think that your demo is still running. Unfortunately, not really a bug.
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Created attachment 151951 [details] 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