When undo is pressed after creating a node in shadergraph window, Main Preview window is opened even if its toggle button was off. Refer the attached video

Steps to reproduce:
1) Create a new project
2) Window > Package Manager > Install ShaderGraph
3) Close the Main preview window by clicking on the toggle button
4) Right-click in project > Create > Shader > PBR Graph
5) Open PBR Graph > Create a new node
6) Press Ctrl + Z or Edit > Undo

Actual result: Main Preview window is opened even though its toggle button is off

Expected result: Only the changes made should be reverted on pressing Undo and Main Preview window shouldn't be opened

Occurring on: 2020.1.0a24, 2019.3.2f1, 2019.3.0a1

Working fine on: 2019.2.11f1

Occurring on package version: 7.2.1, 7.2.0, 7.1.8, 7.1.7

Working fine on Package version: 6.9.2

Environment: Both Windows and Mac