### 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
ERR_FAIL_COND_V(p_caret > carets.size(), "");
	StringBuilder selected_text;
	Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (int i = caret_edit_order.size() - 1; i >= 0; i--) {
		int caret_idx = caret_edit_order[i];
		if (p_caret != -1 && p_caret != caret_idx) {
			continue;
		}
		if (!has_selection(caret_idx)) {
			continue;
		}
		selected_text += _base_get_text(get_selection_from_line(caret_idx), get_selection_from_column(caret_idx), get_selection_to_line(caret_idx), get_selection_to_column(caret_idx));
		if (p_caret == -1 && i != 0) {
			selected_text += "\n";
		}
	}
	return selected_text.as_string();
}
int TextEdit::get_selection_line(int p_caret) const {