Merge pull request #77763 from RedworkDE/warning-dialog-crash

Prevent crashes when removing Viewport from scene tree in event handler

scene/main/viewport.cpp

@@ -2988,10 +2988,12 @@ void Viewport::push_input(const Ref<InputEvent> &p_event, bool p_local_coords) {
 	}
 
 	if (!is_input_handled()) {
+		ERR_FAIL_COND(!is_inside_tree());
 		get_tree()->_call_input_pause(input_group, SceneTree::CALL_INPUT_TYPE_INPUT, ev, this); //not a bug, must happen before GUI, order is _input -> gui input -> _unhandled input
 	}
 
 	if (!is_input_handled()) {
+		ERR_FAIL_COND(!is_inside_tree());
 		_gui_input_event(ev);
 	} else {
 		// Cleanup internal GUI state after accepting event during _input().
@@ -3036,16 +3038,19 @@ void Viewport::push_unhandled_input(const Ref<InputEvent> &p_event, bool p_local
 void Viewport::_push_unhandled_input_internal(const Ref<InputEvent> &p_event) {
 	// Shortcut Input.
 	if (Object::cast_to<InputEventKey>(*p_event) != nullptr || Object::cast_to<InputEventShortcut>(*p_event) != nullptr || Object::cast_to<InputEventJoypadButton>(*p_event) != nullptr) {
+		ERR_FAIL_COND(!is_inside_tree());
 		get_tree()->_call_input_pause(shortcut_input_group, SceneTree::CALL_INPUT_TYPE_SHORTCUT_INPUT, p_event, this);
 	}
 
 	// Unhandled Input.
 	if (!is_input_handled()) {
+		ERR_FAIL_COND(!is_inside_tree());
 		get_tree()->_call_input_pause(unhandled_input_group, SceneTree::CALL_INPUT_TYPE_UNHANDLED_INPUT, p_event, this);
 	}
 
 	// Unhandled key Input - Used for performance reasons - This is called a lot less than _unhandled_input since it ignores MouseMotion, and to handle Unicode input with Alt / Ctrl modifiers after handling shortcuts.
 	if (!is_input_handled() && (Object::cast_to<InputEventKey>(*p_event) != nullptr)) {
+		ERR_FAIL_COND(!is_inside_tree());
 		get_tree()->_call_input_pause(unhandled_key_input_group, SceneTree::CALL_INPUT_TYPE_UNHANDLED_KEY_INPUT, p_event, this);
 	}