Sprite setting window overlaps the header and options when the window is shrunk diagonally

Steps to Repro:
1. Create a new or open attached Project
2. Project window > right-click > Create
3. Sprites > Square
4. Select the Sprite and open Sprite Editor
5. Select the window and Shrink it diagonally

Actual Result:
Sprite settings overlap the window header

Expected Result:
The window is shrunk only to a certain limit or Sprite Settings hides under window header

Environment:
Windows and Mac

Occurring with:
2019.1.0a13, 2018.3.0f2, 2017.15f1