Inspector Window is not resized with 2/3, 4 split, Default and Tall windows layout.

Steps to Repro:
1. Create an empty project
2. Click Window -> Layouts -> 2 by 3
3. Drag Inspector window

Actual Result:
Inspector Window not able to resize except for Wide Layout.

Expected Result:
Inspector Window is resized in any Layout

Reproducible on:
2020.1.0a5

Working fine on:
2020.1.0a4, 2019.3.0b4

Environment:
Occurs only on Linux (ubuntu 16.04 LTS)

NOTE: Does not occur with Wide windows Layout.