E.g. editor windows and help windows. There is no automatic system
shortcut for this on OS X.
Change-Id: I27f1208cde0a6f4b1a6952a7988d00a8481a08a4
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Currently the actions for fullscreen, minimize and zoom only apply to
the main window, even if a different window is active.
Refactor the handling of these actions into a WindowSupport class, and
use that instead for the main window. In a second step, this will be
used to add the functionality to the corresponding external windows
(e.g. help and editor windows)
Change-Id: Ief2c880f40948c3bb724196d6e0cfe888b8ece89
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
