Avoid cyclic iteration check, fixes #24969

main/main.cpp

@@ -1789,6 +1789,10 @@ uint64_t Main::target_ticks = 0;
 uint32_t Main::frames = 0;
 uint32_t Main::frame = 0;
 bool Main::force_redraw_requested = false;
+bool Main::iterating = false;
+bool Main::is_iterating() {
+	return iterating;
+}
 
 // For performance metrics
 static uint64_t physics_process_max = 0;
@@ -1796,6 +1800,10 @@ static uint64_t idle_process_max = 0;
 
 bool Main::iteration() {
 
+	ERR_FAIL_COND_V(iterating, false);
+
+	iterating = true;
+
 	uint64_t ticks = OS::get_singleton()->get_ticks_usec();
 	Engine::get_singleton()->_frame_ticks = ticks;
 	main_timer_sync.set_cpu_ticks_usec(ticks);
@@ -1923,6 +1931,8 @@ bool Main::iteration() {
 		frames = 0;
 	}
 
+	iterating = false;
+
 	if (fixed_fps != -1)
 		return exit;
 

main/main.h

@@ -47,6 +47,7 @@ class Main {
 	static uint32_t frames;
 	static uint32_t frame;
 	static bool force_redraw_requested;
+	static bool iterating;
 
 public:
 	static bool is_project_manager();
@@ -58,6 +59,8 @@ public:
 	static bool iteration();
 	static void force_redraw();
 
+	static bool is_iterating();
+
 	static void cleanup();
 };
 

platform/osx/os_osx.mm

@@ -304,7 +304,9 @@ static Vector2 get_mouse_pos(NSPoint locationInWindow, CGFloat backingScaleFacto
 	if (OS_OSX::singleton->main_loop) {
 		Main::force_redraw();
 		//Event retrieval blocks until resize is over. Call Main::iteration() directly.
-		Main::iteration();
+		if (!Main::is_iterating()) { //avoid cyclic loop
+			Main::iteration();
+		}
 	}
 
 	/*

platform/windows/os_windows.cpp

@@ -783,7 +783,9 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 		case WM_TIMER: {
 			if (wParam == move_timer_id) {
 				process_key_events();
-				Main::iteration();
+				if (!Main::is_iterating()) {
+					Main::iteration();
+				}
 			}
 		} break;