Main preview window name does not change if Shader Graph asset renamed manually.

Steps to reproduce:
1. Create a new project.
2. Add Shader Graph Package from Package Manager.
(Window > Package Manager > Advanced > Check Show Preview Packages > Shader Graph, Click Install)
3. Right-click anywhere in Project View and select Create > Shader > Unlit Graph.
4. Select newly created Shader Asset and Click Open Shader Editor in the Inspector.
5. Right-Click on Shader Asset in the Project View and select Rename.
6. Rename the Asset as 'NewName'.

Actual result:
Preview window name does not change.

Expected result:
Preview window name changes to 'NewName'.

Occurring On:
2019.1.0b4, 2019.2.0a7, 2019.1.0a9

Working fine on: 2018.3.0f2

Package Version: 5.6.1, 5.3.1, 5.1.0.

Note:
1. Due to some Shader Graph package problem, unable to verify this issue in 2019.1.0a1 to 2019.1.0a8 editor versions.
2. The screenshot is attached for reference.

Environment: Mac and Windows.