Make Qt send a QEvent::ApplicationActivate event if NSApplicationDelegate receives "applicationShouldHandleReopen"

Mac application windows are closed by the window close button, but it is expected the application stays active
until the user explicitly quits the app (from application menu, or Cmd-Q). If clicking on the application icon again
an active application is expected to restore its application window (without reloading the app image).
To emulate this more native behavior on Mac it is possible to simple hide the main window on QWidget::closeEvent().
Then, if the user clicks on the dock icon, or double clicks on the app icon in Finder, an applicationShouldHandleReopen is issued, but
ignored by Qt. But if another app was activated and the user clicks back on the dock icon OS X will send a "applicationDidBecomeActive"
and Qt translates it to a QEvent::ApplicationActivate.

It would be nice to also get a QEvent::ApplicationActivate event on "applicationShouldHandleReopen".

Thereby you could write in the main window even handler:

if ((event->type() == QEvent::ApplicationActivate) && (!isVisible())) {
// ohh, must have been closed before
reopen();
}

The 3 line patch I attached makes the event mapping.
It wouldn't affect applications that simply terminate on QWidget::closeEvent().

If it's a little unclear, what I'm talking about (Apple logic), see also:
http://th30z.netsons.org/2008/08/123/ (Carbon hack to solve same problem)
http://lists.trolltech.com/qt-interest/2007-06/thread00801-0.html (a lost user, faces same issue)

Related Apple docs:
http://developer.apple.com/mac/library/documentation/Cocoa/Reference/NSApplicationDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/NSApplicationDelegate/applicationShouldHandleReopen:hasVisibleWindows: