[macOS] Disable live resize in multithreaded rendering mode.

(cherry picked from commit dfa509a3b421f3c1b831967ff58e8b6e5d38e26d)

platform/osx/os_osx.mm

@@ -474,7 +474,7 @@ static NSCursor *cursorFromSelector(SEL selector, SEL fallback = nil) {
 @implementation GodotContentView
 
 - (void)drawRect:(NSRect)dirtyRect {
-	if (OS_OSX::singleton->get_main_loop() && OS_OSX::singleton->is_resizing) {
+	if (OS_OSX::singleton->get_main_loop() && (OS_OSX::singleton->get_render_thread_mode() != OS::RENDER_SEPARATE_THREAD) && OS_OSX::singleton->is_resizing) {
 		Main::force_redraw();
 		if (!Main::is_iterating()) { // Avoid cyclic loop.
 			Main::iteration();