### 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
dragging_selection = true;
	Point2 mp = get_local_mouse_pos();
	Point2i pos = get_line_column_at_pos(mp);
	int line = pos.y;
	int col = pos.x;
	int caret_idx = carets.size() - 1;
	col = 0;
	if (line < carets[caret_idx].selection.selecting_line) {
		
		set_caret_line(line - 1, false, true, 0, caret_idx);
		carets.write[caret_idx].selection.selecting_column = has_selection(caret_idx)
				? text[get_selection_line(caret_idx)].length()
				: 0;
	} else {
		
		set_caret_line(line + 1, false, true, 0, caret_idx);
		carets.write[caret_idx].selection.selecting_column = 0;
		col = text[line].length();
	}
	set_caret_column(0, false, caret_idx);
	select(carets[caret_idx].selection.selecting_line, carets[caret_idx].selection.selecting_column, line, col, caret_idx);
	if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
		DisplayServer::get_singleton()->clipboard_set_primary(get_selected_text());
	}
	queue_redraw();
	click_select_held->start();
	merge_overlapping_carets();
}
void TextEdit::_pre_shift_selection(int p_caret) {