Fix crash in connection dialog

editor/connections_dialog.cpp

@@ -684,6 +684,7 @@ void ConnectionsDock::_connect(ConnectDialog::ConnectionData p_cd) {
 	}
 
 	Callable callable = p_cd.get_callable();
+	Ref<EditorUndoRedoManager> &undo_redo = EditorNode::get_undo_redo();
 	undo_redo->create_action(vformat(TTR("Connect '%s' to '%s'"), String(p_cd.signal), String(p_cd.method)));
 	undo_redo->add_do_method(source, "connect", p_cd.signal, callable, p_cd.flags);
 	undo_redo->add_undo_method(source, "disconnect", p_cd.signal, callable);
@@ -704,6 +705,7 @@ void ConnectionsDock::_disconnect(TreeItem &p_item) {
 
 	ERR_FAIL_COND(cd.source != selected_node); // Shouldn't happen but... Bugcheck.
 
+	Ref<EditorUndoRedoManager> &undo_redo = EditorNode::get_undo_redo();
 	undo_redo->create_action(vformat(TTR("Disconnect '%s' from '%s'"), cd.signal, cd.method));
 
 	Callable callable = cd.get_callable();
@@ -730,6 +732,7 @@ void ConnectionsDock::_disconnect_all() {
 
 	TreeItem *child = item->get_first_child();
 	String signal_name = item->get_metadata(0).operator Dictionary()["name"];
+	Ref<EditorUndoRedoManager> &undo_redo = EditorNode::get_undo_redo();
 	undo_redo->create_action(vformat(TTR("Disconnect all from signal: '%s'"), signal_name));
 
 	while (child) {
@@ -991,10 +994,6 @@ void ConnectionsDock::_bind_methods() {
 	ClassDB::bind_method("update_tree", &ConnectionsDock::update_tree);
 }
 
-void ConnectionsDock::set_undo_redo(Ref<EditorUndoRedoManager> p_undo_redo) {
-	undo_redo = p_undo_redo;
-}
-
 void ConnectionsDock::set_node(Node *p_node) {
 	selected_node = p_node;
 	update_tree();

editor/connections_dialog.h

@@ -47,7 +47,6 @@
 #include "scene/gui/tree.h"
 
 class ConnectDialogBinds;
-class EditorUndoRedoManager;
 
 class ConnectDialog : public ConfirmationDialog {
 	GDCLASS(ConnectDialog, ConfirmationDialog);
@@ -197,7 +196,6 @@ class ConnectionsDock : public VBoxContainer {
 	Button *connect_button = nullptr;
 	PopupMenu *signal_menu = nullptr;
 	PopupMenu *slot_menu = nullptr;
-	Ref<EditorUndoRedoManager> undo_redo;
 	LineEdit *search_box = nullptr;
 
 	HashMap<StringName, HashMap<StringName, String>> descr_cache;
@@ -231,7 +229,6 @@ protected:
 	static void _bind_methods();
 
 public:
-	void set_undo_redo(Ref<EditorUndoRedoManager> p_undo_redo);
 	void set_node(Node *p_node);
 	void update_tree();