### 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
for (int j = i + 1; j < caret_edit_order.size(); j++) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (has_selection(caret_edit_order[j]) && get_selection_from_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				if (!has_selection(caret_edit_order[j])) {
					i = j;
					caret_idx = caret_edit_order[i];
				}
			}
			if (get_caret_column(caret_idx) == curline_len) {
				continue;
			}
			
			next_column = curline_len;
			next_line = get_caret_line(caret_idx);
			
			for (int j = i - 1; j >= 0; j--) {
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx)) {
					break;
				}
				carets_to_remove.push_back(caret_edit_order[j]);
			}
		} else if (p_word && get_caret_column(caret_idx) < curline_len - 1) {
			
			int line = get_caret_line(caret_idx);
			int column = get_caret_column(caret_idx);
			PackedInt32Array words = TS->shaped_text_get_word_breaks(text.get_line_data(line)->get_rid());