UV Selection dropdown is overlapping on the camera icon from UV Editor Toolbar while resizing the UV Editor Window

Steps to repro:
1. Create a new project.
2. Install "ProBuilder" package from Window > Package Manager.
3. Tools > ProBuilder > ProBuilder Window
4. Open UV Editor from ProBuilder window
5. Resize UV Editor Window to its minimum size

Actual Result:
UV Selection dropdown is overlapping on UV Editor Toolbar

Expected Result:
UV Selection dropdown doesn't overlap with UV Editor Toolbar

Package occurring version: 4.1.0, 4.0.2

Package working fine version: 3.10.1, 3.0.0

Reproducible in:
2019.3.0a12, 2019.2.1f1, 2019.1.0f2, 2018.3.0f2

Environment:
Windows 10 and macOS 10.14