Auto warp mouse to stream or PIP source screen when entering streamed content (unexposed setting)

[waydabber]

Discussed here: #612 (comment)

[waydabber]

I added this as an unexposed setting. I don't think it works really well (the mouse warp breaks the mouse momentum and is generally disruptive).

To enable auto-warp to source screen for PIP or full screen stream you need to enable it using the following command line command:

defaults write pro.betterdisplay.BetterDisplay pipAutoWarp YES

defaults write pro.betterdisplay.BetterDisplay screenStreamAutoWarp YES

[huyuansong]

In the scenario where the iPad is used as a second extended screen, I think it would be better if the mouse is defaulted in the streaming. When I want to switch to the original screen, I can do it by pressing a shortcut key.
If the mouse switches between the two scenarios accidentally, it will undoubtedly cause trouble in use, and it often happens that you can't find where the mouse is. Please consider the situation where the iPad is used as the second screen and the vertical streaming covers the original screen. In this case, the direction of the mouse is vertical, which is really annoying.