Python runner ignores SIGINT

[gaycodegal]

Bug Description

Running slint with python3 main.py ignores SIGINT (^C) in the terminal. I had to write this wrapper script to kill the app.

https://github.com/gaycodegal/LinuxAlarm/blob/b7a23a4a6ed924e5a9cf6cf30e607d0b65bdcaad/alarm_slint/run.sh

Reproducible Code (if applicable)

Minimal sample project at commit https://github.com/gaycodegal/LinuxAlarm/tree/b7a23a4a6ed924e5a9cf6cf30e607d0b65bdcaad

Theoretically any slint app should have this bug

Environment Details

• Slint Version: Version: 1.13.1b1
• Platform/OS: Linux (6.14.0-29-generic Make it possible to define constants #29-Ubuntu SMP PREEMPT_DYNAMIC Thu Aug 7 18:32:38 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux)
• Programming Language: python
• Backend/Renderer: Whatever comes default with python - I'd have to assume Qt as it works with the orca screen reader

Product Impact

• just building a timer app because the gnome clock app doesn't support command line arguments
• impact: inconvenience
  • I have a workaround which is linked so it's not a big issue but filing a bug to alert the slint team of the issue

[tronical]

That's an interesting point. I guess python catches SIGINT but has no way of delivering the exception to the interpreter, as the event loop is run by Slint. Perhaps Slint should override SIGINT to default while the event loop is running and reset it back to Python's default handler when returning.

[ogoffart]

Slint should override SIGINT to default

Or to exit the event loop.