[improvement] when moving space to another display

[rwijtvliet]

Currently, when moving a space from one display to another, there are 2 issues that I suggest could be improved:

• The order of the spaces is indeterminate. I.e., it is unclear, where the space will move to in the mission control index. To make this determinate, the spaces on each display could be sorted (e.g. by their labels) whenever a space is moved to another display.

• The focus may move to another window. Here the improvement is to keep track of the focused window before the move and refocus it afterwards.