Anchors don't work with negatively scaled Controls

[kiriri]

Godot version:
3.2.2

OS/device including version:
Any

Issue description:
Resizing a parent control node doesn't resize the child correctly, if the child has negative rect_scale

Steps to reproduce:
(Using the example project)
Select 'Control' node and resize it (via red bubbles / Q transformation tool).
The child will behave unexpected by leaving the parent's bounds.

Minimal reproduction project:
Bug_NegativeScale-Anchors.zip

[KoBeWi]

This happens with any scale other than 1,1.
Duplicate of #19068