--- a/src/plugins/platforms/cocoa/qcocoaeventdispatcher.mm	2016-03-22 05:31:40.000000000 0100
+++ b/src/plugins/platforms/cocoa/qcocoaeventdispatcher.mm	2016-03-22 05:31:40.000000000 0100
@@ -473,27 +473,34 @@
                         }
                     }
                 } while (!d->interrupt && event != nil);
-            } else do {
-                // INVARIANT: No modal window is executing.
-                event = [NSApp nextEventMatchingMask:NSAnyEventMask
-                untilDate:nil
-                inMode:NSDefaultRunLoopMode
-                dequeue: YES];
+            } else {
+                bool mouseDownEventFound = false;
+                do {
+                    // INVARIANT: No modal window is executing.
+                    event = [NSApp nextEventMatchingMask:NSAnyEventMask
+                                                         untilDate:nil
+                                                         inMode:NSDefaultRunLoopMode
+                                                         dequeue: YES];
 
-                if (event) {
-                    if (flags & QEventLoop::ExcludeUserInputEvents) {
-                        if (IsMouseOrKeyEvent(event)) {
-                            [event retain];
-                            d->queuedUserInputEvents.append(event);
-                            continue;
+                    if (event) {
+                        if (flags & QEventLoop::ExcludeUserInputEvents) {
+                            // Workaround for QTBUG-53126
+                            // Process (and not queue) NSLeftMouseUp event if there is no NSLeftMouseDown
+                            // even if we are in excludeUserEvents mode
+                            if ([event type] == NSLeftMouseDown) mouseDownEventFound = true;
+                            if (IsMouseOrKeyEvent(event) && (mouseDownEventFound || ([event type] != NSLeftMouseUp) ) ) {
+                                [event retain];
+                                d->queuedUserInputEvents.append(event);
+                                continue;
+                            }
+                        }
+                        if (!filterNativeEvent("NSEvent", event, 0)) {
+                            [NSApp sendEvent:event];
+                            retVal = true;
                         }
                     }
-                    if (!filterNativeEvent("NSEvent", event, 0)) {
-                        [NSApp sendEvent:event];
-                        retVal = true;
-                    }
-                }
-            } while (!d->interrupt && event != nil);
+                } while (!d->interrupt && event != nil);
+            }
 
             if ((d->processEventsFlags & QEventLoop::EventLoopExec) == 0) {
                 // when called "manually", always send posted events and timers