winemac: Don't reorder clicked window relative to sibling owned windows if it's in the right place.

dlls/winemac.drv/cocoa_app.m

@@ -1480,10 +1480,30 @@ int macdrv_err_on;
                 // respect to its siblings, but we want it to.  We have to do it
                 // manually.
                 NSWindow* parent = [window parentWindow];
+                NSInteger level = [window level];
+                __block BOOL needReorder = FALSE;
+
+                // If the window is already the last child or if it's only below
+                // children with higher window level, then no need to reorder it.
+                [[parent childWindows] enumerateObjectsWithOptions:NSEnumerationReverse
+                                                        usingBlock:^(id obj, NSUInteger idx, BOOL *stop){
+                    WineWindow* child = obj;
+                    if (child == window)
+                        *stop = TRUE;
+                    else if ([child level] <= level)
+                    {
+                        needReorder = TRUE;
+                        *stop = TRUE;
+                    }
+                }];
+
+                if (needReorder)
+                {
                     [parent removeChildWindow:window];
                     [parent addChildWindow:window ordered:NSWindowAbove];
                 }
             }
+        }
 
         if (mouseCaptureWindow)
             window = mouseCaptureWindow;