**Describe the bug**
Dragging left side of window moves right side of window, which might make it disappear completely.
**To Reproduce**
Steps to reproduce the behavior:
1. Click left side of wi…
#### Problem Description
Natively since Python 3.9, but using `from __future__ import annotations` on some version prior you can use syntax like `str | int` instead of `Union[str, int]`. This is supp…