src/vs/workbench/api/browser/mainThreadDocuments.ts/MainThreadDocuments/isCaughtUpWithContentChanges
class MainThreadDocuments:	public isCaughtUpWithContentChanges(resource: URI): boolean {
		const tracker = this._modelTrackers.get(resource);
		if (tracker) {
			return tracker.isCaughtUpWithContentChanges();
		}
		return true;
	}