### Godot version

v4.0.beta.custom_build [13f0158]

### System information

Windows 10

### Issue description

When doing operations (`begin_complex_operation` and `end_complex_operation`) with multiple selections in TextEdit, some of these selections don't revert upon undo. This behavior is affects some of script editor's operations, like duplicate selection and delete lines.

### Steps to reproduce

Open script editor, make multiple selections. Keep in mind what you have selected. Do duplicate selection (ctrl+shift+D). Undo (ctrl+Z). Compare the result to what you remember.

### Minimal reproduction project

N/A
CHECK(text_edit->get_caret_column() == 2);
			CHECK(text_edit->get_caret_column(1) == 2);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK("text_changed", empty_signal_args);
			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
			text_edit->set_editable(false);
			SEND_GUI_KEY_EVENT(Key::A);
			CHECK_FALSE(text_edit->get_viewport()->is_input_handled()); 
			CHECK(text_edit->get_text() == "aA\naA");
			CHECK(text_edit->get_caret_column() == 2);
			CHECK(text_edit->get_caret_column(1) == 2);
			SIGNAL_CHECK_FALSE("caret_changed");
			SIGNAL_CHECK_FALSE("text_changed");
			SIGNAL_CHECK_FALSE("lines_edited_from");
			text_edit->set_editable(true);
			lines_edited_args.push_back(lines_edited_args[1].duplicate());
			lines_edited_args.push_front(args2.duplicate());
			text_edit->select(0, 0, 0, 1);
			text_edit->select(1, 0, 1, 1, 1);
			SEND_GUI_KEY_EVENT(Key::B);
			CHECK(text_edit->get_viewport()->is_input_handled());
			CHECK(text_edit->get_text() == "BA\nBA");
			CHECK(text_edit->get_caret_column() == 1);
			CHECK(text_edit->get_caret_column(1) == 1);
			SIGNAL_CHECK("caret_changed", empty_signal_args);
			SIGNAL_CHECK("text_changed", empty_signal_args);
			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
			SEND_GUI_ACTION("ui_text_toggle_insert_mode");
			CHECK(text_edit->is_overtype_mode_enabled());
			SEND_GUI_KEY_EVENT(Key::B);