### 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 (!editable) {
		return;
	}
	start_action(EditAction::ACTION_BACKSPACE);
	Vector<int> carets_to_remove;
	Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (int i = 0; i < caret_edit_order.size(); i++) {
		int caret_idx = caret_edit_order[i];
		if (get_caret_column(caret_idx) == 0 && get_caret_line(caret_idx) == 0 && !has_selection(caret_idx)) {
			continue;
		}
		if (has_selection(caret_idx) || (!p_all_to_left && !p_word) || get_caret_column(caret_idx) == 0) {
			backspace(caret_idx);
			continue;
		}
		if (p_all_to_left) {
			int caret_current_column = get_caret_column(caret_idx);
			set_caret_column(0, caret_idx == 0, caret_idx);