src/vs/editor/contrib/suggest/browser/suggestWidget.ts/PersistedWidgetSize/restore
class PersistedWidgetSize:	restore(): dom.Dimension | undefined {
		const raw = this._service.get(this._key, StorageScope.GLOBAL) ?? '';
		try {
			const obj = JSON.parse(raw);
			if (dom.Dimension.is(obj)) {
				return dom.Dimension.lift(obj);
			}
		} catch {
			// ignore
		}
		return undefined;
	}