OSX: a window which has WindowDoesNotAcceptFocus isn't first responder

Change-Id: If02ce190d93fcae18f1e1b41bc73c83b3226d4e7
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>

src/plugins/platforms/cocoa/qnsview.mm

@@ -397,6 +397,8 @@ static QTouchDevice *touchDevice = 0;
 
 - (BOOL)acceptsFirstResponder
 {
+    if (m_window->flags() & Qt::WindowDoesNotAcceptFocus)
+        return NO;
     if ((m_window->flags() & Qt::ToolTip) == Qt::ToolTip)
         return NO;
     return YES;