Scrolling in output window does not work when Display Scale is set to Custom

[Nova840]

Godot version

v4.1.3.stable.official [f06b6836a]

System information

Godot v4.1.3.stable - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 960 (NVIDIA; 31.0.15.4617) - AMD FX(tm)-6300 Six-Core Processor (6 Threads)

Issue description

When the display scale is set to certain custom values, the scroll bar will not scroll down to the most recent message when printing something from _process(). It looks to be similar to #78434 and #79975, but only happens for custom display scales.

Desktop.2023.11.21.-.00.12.55.02-handbrake.mp4

Steps to reproduce

1. Start a new project
2. In Editor Settings, change "Display Scale" to "Custom"
3. Change "Custom Display Scale" to 0.8
4. Create a script that prints a message from _process()
5. Run the project, notice how the scroll bar doesn't move down to follow the most recent message

Minimal reproduction project

Output Test.zip

(This is just a project that calls print() from _process(), as I can't include the editor settings in the project)

[bruvzg]

Probably duplicate of #82041 should be fixed by #82079.