While creating Bones if clicked on Visibility Panel, Bone gets created in the skinning editor under "Sprite Editor" Window, also when Panel's Visibility is disabled created bone gets clipped while scrolling horizontally and vertically, refer the attached video

Steps to repro:
1. Create a new project
2. Window > Package Manager > 2D Animation(4.0.0) > Install
3. Import Sample Project Under 2D Animation Package
4. Asset > Unity Technology > 2D Animation > Sample > Sprite > Boris
5. Open Sprite Editor > Skinning Editor
6. Enable Visibility of Panel
7. Create Bone using "Create Tool" and while creating Bone click on Visibility Panel

Actual Result:
Bone gets created while mouse is clicked on "Visibility" panel

Expected Result:
Bone shouldn't create clicking on "Visibility" panel

Reproducible on:
2020.1.0a14, 2019.3.0f1

Note: 2D animation package 3.0.2 is introduced in unity 2019.3.0a10

Package Found version: 4.0.0, 3.0.8, 3.0.5

Package working fine version: 3.0.3, 3.0.2

Environment:
Windows 10 & macOS 10.14