When ordering a key window out Cocoa
tries to find a new KEY window. Looks like it prefers the current MAIN
window and since QNSPanel is never a main window, Cocoa is breaking
the stack order. To avoid this - try to change the key
window BEFORE ordering out a window.
The application has a stack of all open windows (visible and hidden),
we iterate through this stack starting from our current key window
and look for the nearest window below, that can become a new key window.
Most probably, it will be our transient parent :)
This code will change (potentially) the key window _only_
if there is a transient parent.
Task-number: QTBUG-39809
Change-Id: I96b630799341875fc7e38dabf1ff6416338e687b
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
da0c74550f