### 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
MessageQueue::get_singleton()->flush();
	text_edit->set_caret_blink_enabled(false);
	CHECK_FALSE(text_edit->is_caret_blink_enabled());
	text_edit->set_caret_blink_enabled(true);
	CHECK(text_edit->is_caret_blink_enabled());
	text_edit->set_caret_blink_interval(10);
	CHECK(text_edit->get_caret_blink_interval() == 10);
	ERR_PRINT_OFF;
	text_edit->set_caret_blink_interval(-1);
	CHECK(text_edit->get_caret_blink_interval() == 10);
	text_edit->set_caret_blink_interval(0);
	CHECK(text_edit->get_caret_blink_interval() == 10);
	ERR_PRINT_ON;
	text_edit->set_caret_type(TextEdit::CaretType::CARET_TYPE_LINE);
	CHECK(text_edit->get_caret_type() == TextEdit::CaretType::CARET_TYPE_LINE);
	text_edit->set_caret_type(TextEdit::CaretType::CARET_TYPE_BLOCK);
	CHECK(text_edit->get_caret_type() == TextEdit::CaretType::CARET_TYPE_BLOCK);
	text_edit->set_caret_type(TextEdit::CaretType::CARET_TYPE_LINE);
	CHECK(text_edit->get_caret_type() == TextEdit::CaretType::CARET_TYPE_LINE);
	int caret_col = text_edit->get_caret_column();
	text_edit->set_move_caret_on_right_click_enabled(false);
	CHECK_FALSE(text_edit->is_move_caret_on_right_click_enabled());
	SEND_GUI_MOUSE_BUTTON_EVENT(Point2i(100, 1), MouseButton::RIGHT, MouseButtonMask::RIGHT, Key::NONE);
	CHECK(text_edit->get_caret_column() == caret_col);
	text_edit->set_move_caret_on_right_click_enabled(true);
	CHECK(text_edit->is_move_caret_on_right_click_enabled());
	SEND_GUI_MOUSE_BUTTON_EVENT(Point2i(100, 1), MouseButton::RIGHT, MouseButtonMask::RIGHT, Key::NONE);
	CHECK(text_edit->get_caret_column() != caret_col);
	text_edit->set_move_caret_on_right_click_enabled(false);
	CHECK_FALSE(text_edit->is_move_caret_on_right_click_enabled());