Restore functionality doesn't work
a. On Mac and 'Resyncing To Revision' popup appears and doesn't disappear at all while trying to restore from collab history
b. On windows save scene popup doesn't appear unless user clicks outside the editor first

Steps To Reproduce:

1. Create a new Project
2. Window > Services > Select an organisation to set up
3. File > Project Settings > Collaborate > On
3. Hierarchy > Create > 3D> Cube > Save Scene
4. Collab > History > Changes > Restore

Expected Result:
1. The created cube disappears

Actual Result:
1. On Mac, 'Resyncing To Revision' popup appears and doesn't disappear and thus restoration fails
2. On Windows, Save scene popup doesn't appear unless the user clicks outside unity editor first

Reproducible On: 2020.2.0a1, 2020.1.0a14, 2020.1.0a25
Package Version: 1.3.7

Note: In Unity version 2020.2.0a1, restore works on Mac though the 'Resyncing To Revision' doesn't disappear

Not Reproducible On: 2020.1.0a13,
Package Version: 1.2.16

Note: Collab was broken from version 2020.1.0a14 - 2020.1.0a22
Fogbugz ID: https://fogbugz.unity3d.com/f/cases/1212232/

Environment: Win and Mac