Resizing Editor Docks is not consistent.

[kitbdev]

Godot version

4.0, 4.1, 4.2.beta, all versions

System information

Godot v4.2.beta (a574c02) - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2070 (NVIDIA; 31.0.15.3598) - Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz (12 Threads)

Issue description

Adjusting the split between docks works differently depending on the one dragged. It is not symmetric, all docks to the right are scaled, the left ones aren't affected.
This also applies anytime there is a hierarchy of SplitContainers intended to work together.
Example:

The current behavior is not intuitive to the user and should be fixed.

related godotengine/godot-proposals#7233 (comment)
related godotengine/godot-proposals#4033

Also, I'm already working on a PR for this.

Steps to reproduce

Adjust docks in the editor.
Or create multiple nested SplitContainers and see how resizing and dragging works between them.

Minimal reproduction project

n/a