Cocoa: Don't stop NSApp when showing a modal dialog

We manage embedded modal sessions with a stack and only run
the top-most session. We also stop the last modal session
before starting a new one. However, if there is no modal
session running yet, we end up stopping NSApp. This seems
to cause ill side effects on OS X 10.9. Notably, starting
a new modal session outside QCocoaEventDispatcher, like when
opening a native file dialog, makes this last modal session
impossible for the user to quit.

In this patch, we make sure NSApp is kept running if there's
no modal session running yet, akin to calling QDialog::exec()
at the event dispatcher level. The behavior for ensuing modal
sessions remains unchanged.

Task-number: QTBUG-34677
Change-Id: I6a23b191e4dce18514504b8e953f8caa7fad8731
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

0 files changed, 0 insertions, 0 deletions