Name of Graphs/Shader window is clipped.

Steps to Reproduce.
1. Create a new project
2. Window > Package Manager > All > Shader Graph > Install
3. Project > Create > Shader > PBR Graph / Sub Graph / Unlit Graph
4. Open Shader Editor from inspector
5. Observe that name appears to be clipped

Expected result:
A full name of window should be visible. It should resize according to tab size.

Reproducible on:
Unity 2018.2.0b6, 2018.2.0b1, 2018.1.0f2, 2018.1.0b5

Note:
1. In 2018.3.0a1, PBR Graph / Sub Graph / Unlit Graph options are not available.
2. In 2018.2.0a8 to 2018.2.0a1, Package Manager is not included.
3. In 2018.1.0b4 and lower versions, Package Manager is not included.

Environment:
Mac 10.13, 10.12 and Windows 10,7