cocoa: Popup menus always accept first click

src/video/cocoa/SDL_cocoawindow.m

@@ -2104,7 +2104,9 @@ static void Cocoa_SendMouseButtonClicks(SDL_Mouse *mouse, NSEvent *theEvent, SDL
 
 - (BOOL)acceptsFirstMouse:(NSEvent *)theEvent
 {
-    if (SDL_GetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH)) {
+    if (_sdlWindow->flags & SDL_WINDOW_POPUP_MENU) {
+        return YES;
+    } else if (SDL_GetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH)) {
         return SDL_GetHintBoolean(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, false);
     } else {
         return SDL_GetHintBoolean("SDL_MAC_MOUSE_FOCUS_CLICKTHROUGH", false);