If the project has cursor lock during play, the user cannot regain control after calling out a window during Playmode.
This happens to windows that are external to Unity. For example, if user call out Build Setting window, which is a native Unity Editor window, the cursor unlocks and everything works well. If user chooses CMD + B (Build...), and a Mac system window shows up, asking for save location and file name, the cursor remains locked.

List of the same situations during Playmode:
- Build (CMD + B)
- Open (CMD + O)
- Calls out Mission Control (Three finger swipe up. See attached image for reference)

Repro:
1. Launch Unity and open the attached project
2. Open "Main" scene
3. Enter Playmode (make sure the cursor is locked in the game view)
4. Press CMD + B or any action from the list above
5. Try to use mouse and move the cursor.

Expected: Cursor is free to move when a window pops out in Playmode
Actual: Cursor does not unlock when a window shows up in Playmode

Similar bug: https://fogbugz.unity3d.com/f/cases/1006813/
And it is fixed in PR: https://ono.unity3d.com/unity/unity/pull-request/72586/_/platform/osx/fix-cursor-locked-on-exit