[Feature request] Implement onbeforeunload for script editors

[P6g9YHK6]

Is your feature request related to a problem? Please describe.
when unsaved changes have been made to a script trmm prompt to save when leaving the script editor.
This does not trigger the builtin browser onbeforeunload api and could very much lead to a loss of work when the event is done on tab/window level rather than trmm

Describe the solution you'd like
when the condition to make the confirmation window appear when leaving are met trigger a beforeunload event
https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event

Describe alternatives you've considered
N/A

Additional context