Printing with 2 fullscreen windows

When you have 2 fullscreen instances and press cmd+p to print, the print dialog opens everytime at the first instance even if you are at the second instance.

Reproduce the issue in MacDown with two fullscreen windows, switching between the first and second before pressing cmd+p. Trace how the print command chooses a window and compare which instance owns the active document. Done means the print dialog opens for the currently active fullscreen instance rather than always the first one.

Written by the indexing model from the issue text.