Steps to Repro:
1. Import any Texture as Sprite
2. Open Sprite Editor Window
3. Select 'Custom Outline' in Sprite Editor Window
4. Click Generate
5. Try to move control points

Expected Result:
Able to select and move control points

Actual Result:
Control points are highlighted when the mouse is over but unable to select and move control points. Mouse actual position needs to be offset from the control point to select and move it.

Note:
The outline movement is not smooth in 2018.2.0a4

Occurring With:
2018.2.0a7, 2018.2.0a6, 2018.2.0a5

Working With:
2018.2.0a4, 2018.2.0a2, 2018.1.0b13

Environment:
Windows 10, Mac 10.12, 10.13