Fast scrolling in the in TextEdit with Alt key does not actually speed up the scroll if smooth scrolling is enabled

[Yagich]

Godot version

4.0b1 (affects >=3.4)

System information

Linux/Manjaro

Issue description

#48599 added a feature to TextEdit to scroll 5x faster when the Alt key is held. This works great on TextEdits without smooth scrolling, but on those with it, instead of scrolling faster, it will simply put the "target line" further, which will take longer to scroll to.

Related/possible duplicate of: #56317

Steps to reproduce

1. Make a TextEdit and fill it with plenty of lines to scroll through
2. Scroll through it holding Alt, note the speed
3. Set scroll_smooth to true
4. Try scrolling with Alt again and note the difference in behavior.

Minimal reproduction project

No response