Zooming in the script editor freezes the editor

[Chaosus]

Godot version

8449592

System information

Windows 11

Issue description

Zooming in the script editor on an empty script freezes the entire editor for a few seconds, but if the file is large then it freezes for 4-5 seconds (which is unacceptable). Looks like a recent regression.

Steps to reproduce

Just zoom in/out on the large script file.

Minimal reproduction project

N/A

[jsjtxietian]

I run an test with around a gdscript with around 200 lines, zoom in and out for a while, this is intel vtune's report of my test:

It seems Control::set_theme is the hotspot here. And the call stack is a little weird, the event propagation seems like wrong...

[bruvzg]

Seems like something is wrong with theme propagation:

But bisects to the #79166 (I guess can be fixed by reintroducing checks as recursive), but theme propagation probably do excessive font updates as well.

[Chaosus]

Fixed by #81406