Resizing subwindows / popups does not work correctly

[aylamz]

Godot version

v4.0.stable.official [92bee43ad]

System information

Fedora 37 KDE, Wayland, RX 6600

Issue description

Resizing editor subwindows/popups does not work as expected. This bug does not happen when resizing the main window.

https://user-images.githubusercontent.com/85757201/224349979-f852f617-1990-4b20-9b35-39aad12860cb.mp4

Steps to reproduce

1. Open Godot Engine
2. Click on "New project", "Import", "Scan", or "About" (works with other popups as well)
3. Try resizing the popup window

Minimal reproduction project

N/A