Prevent pending input event callbacks from erasing the window in the middle of a loop.

platform/macos/display_server_macos.mm

@@ -411,13 +411,17 @@ void DisplayServerMacOS::_dispatch_input_event(const Ref<InputEvent> &p_event) {
 				}
 			}
 		} else {
-			// Send to all windows.
+			// Send to all windows. Copy all pending callbacks, since callback can erase window.
+			Vector<Callable> cbs;
 			for (KeyValue<WindowID, WindowData> &E : windows) {
 				Callable callable = E.value.input_event_callback;
 				if (callable.is_valid()) {
-					callable.call(p_event);
+					cbs.push_back(callable);
 				}
 			}
+			for (const Callable &cb : cbs) {
+				cb.call(p_event);
+			}
 		}
 		in_dispatch_input_event = false;
 	}