SDL: Changing game resolution while window is in non-primary screen will snap it back to the primary screen

Regression from 2.1.20. Is there a new flag we need to set?

May need to consider how full screen handles with multi monitors.

Do we want full screen to snap to the monitor that the window is in?

For example, if starting in windowed mode: drag window to screen 2, then toggle full screen. Does the game currently snap to screen 1, or screen 2? Should it snap to screen 2? (I'm thinking yeah.)

mentioned in merge request !415 (merged)

closed via merge request !415 (merged)

mentioned in commit 974a8e3e