[Cocoa] QDialogs with WindowStayOnStopHint parent

The problem is with beginModalSession which reorders the windows and
sends our window back. This patch queries the window level before
calling beginModalSession and sets it after beginModalSession.

Task-number: QTBUG-9392
Reviewed-by: Richard Moe Gustavsen

1 files changed, 8 insertions, 1 deletions

diff --git a/src/gui/kernel/qeventdispatcher_mac.mm b/src/gui/kernel/qeventdispatcher_mac.mm
index 62e1e81..a7f1224 100644
--- a/src/gui/kernel/qeventdispatcher_mac.mm
+++ b/src/gui/kernel/qeventdispatcher_mac.mm
@@ -831,7 +831,14 @@ NSModalSession QEventDispatcherMacPrivate::currentModalSession()
             QBoolBlocker block1(blockSendPostedEvents, true);
             info.nswindow = window;
             [(NSWindow*) info.nswindow retain];
-            info.session = [NSApp beginModalSessionForWindow:window];
+            // When creating a modal session cocoa will rearrange the windows.
+            // In order to avoid windows to be put behind another we need to
+            // keep the window level.
+            {
+                int level = [window level];
+                info.session = [NSApp beginModalSessionForWindow:window];
+                [window setLevel:level];
+            }
         }
         currentModalSessionCached = info.session;
     }