On OSX, made sure popup menus are dismissed when the main menu is opened.

modules/juce_events/native/juce_mac_MessageManager.mm

@@ -29,6 +29,9 @@ AppFocusChangeCallback appFocusChangeCallback = nullptr;
 typedef bool (*CheckEventBlockedByModalComps) (NSEvent*);
 CheckEventBlockedByModalComps isEventBlockedByModalComps = nullptr;
 
+typedef void (*MenuTrackingBeganCallback)();
+MenuTrackingBeganCallback menuTrackingBeganCallback = nullptr;
+
 //==============================================================================
 struct AppDelegate
 {
@@ -38,6 +41,11 @@ public:
         static AppDelegateClass cls;
         delegate = [cls.createInstance() init];
 
+        NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
+
+        [center addObserver: delegate selector: @selector (trackingBegan:)
+                       name: NSMenuDidBeginTrackingNotification object: nil];
+
         if (JUCEApplicationBase::isStandaloneApp())
         {
             [NSApp setDelegate: delegate];
@@ -49,8 +57,6 @@ public:
         }
         else
         {
-            NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
-
             [center addObserver: delegate selector: @selector (applicationDidResignActive:)
                            name: NSApplicationDidResignActiveNotification object: NSApp];
 
@@ -104,6 +110,7 @@ private:
             addMethod (@selector (applicationDidResignActive:),   applicationDidResignActive, "v@:@");
             addMethod (@selector (applicationWillUnhide:),        applicationWillUnhide,      "v@:@");
             addMethod (@selector (broadcastMessageCallback:),     broadcastMessageCallback,   "v@:@");
+            addMethod (@selector (trackingBegan:),                trackingBegan,              "v@:@");
             addMethod (@selector (dummyMethod),                   dummyMethod,                "v@:");
 
             registerClass();
@@ -169,6 +176,12 @@ private:
             MessageManager::getInstance()->deliverBroadcastMessage (messageString);
         }
 
+        static void trackingBegan (id /*self*/, SEL, NSNotification*)
+        {
+            if (menuTrackingBeganCallback != nullptr)
+                (*menuTrackingBeganCallback)();
+        }
+
         static void dummyMethod (id /*self*/, SEL) {}   // (used as a way of running a dummy thread)
 
     private:

modules/juce_gui_basics/native/juce_mac_MainMenu.mm

@@ -595,8 +595,18 @@ const PopupMenu* MenuBarModel::getMacExtraAppleItemsMenu()
              ? JuceMainMenuHandler::instance->extraAppleMenuItems.get() : nullptr;
 }
 
+typedef void (*MenuTrackingBeganCallback)();
+extern MenuTrackingBeganCallback menuTrackingBeganCallback;
+
+static void mainMenuTrackingBegan()
+{
+    PopupMenu::dismissAllActiveMenus();
+}
+
 void juce_initialiseMacMainMenu()
 {
+    menuTrackingBeganCallback = mainMenuTrackingBegan;
+
     if (JuceMainMenuHandler::instance == nullptr)
         MainMenuHelpers::rebuildMainMenu (nullptr);
 }