PopupMenu: Add explicit focus order to menu items

Without this VoiceOver will iterate over menu items left to right first,
and iteration order will be affected by whether the PopupMenu gets
broken up into multiple columns due to not enough screen space.

modules/juce_gui_basics/menus/juce_PopupMenu.cpp

@@ -391,6 +391,7 @@ struct MenuWindow  : public Component
             if (i + 1 < menu.items.size() || ! item.isSeparator)
             {
                 auto* child = items.add (new ItemComponent (item, options, *this));
+                child->setExplicitFocusOrder (1 + i);
 
                 if (initialSelectedId != 0 && item.itemID == initialSelectedId)
                     setCurrentlyHighlightedChild (child);