Only in scene view using right click on the mouse to enter Flythrough mode and moving to the edge of the screen it stops and you have to right click again to for example rotate the view. In model preview it works fine. Only on windows, MacBook works fine

To reproduce:
1. Open a new project on Unity
2. Open scene view
3. Right click in scene view to enter Flythrough mode
4. While holding right click on the mouse, drag the mouse to the edge of the screen

Expected result: view rotation does not stop
Actual result: view rotation stops when reached edge of the screen

Reproduced on: 2017.3.0a1
Not reproduced: 2017.1.0f3 2017.2.0b4
Regression introduced in 2017.3.0a1