### 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
if (pending_action_end) {
		start_action(EditAction::ACTION_NONE);
		return;
	}
	if (current_op.type == TextOperation::TYPE_NONE) {
		return; 
	}
	if (next_operation_is_complex) {
		current_op.chain_forward = true;
		next_operation_is_complex = false;
	}
	undo_stack.push_back(current_op);
	current_op.type = TextOperation::TYPE_NONE;
	current_op.text = "";
	current_op.chain_forward = false;
	if (undo_stack.size() > undo_stack_max_size) {
		undo_stack.pop_front();
	}
}
void TextEdit::_do_text_op(const TextOperation &p_op, bool p_reverse) {