src/vs/workbench/api/browser/mainThreadDocuments.ts/MainThreadDocuments/handleModelRemoved
class MainThreadDocuments:	handleModelRemoved(modelUrl: URI): void {
		if (!this._modelTrackers.has(modelUrl)) {
			return;
		}
		this._modelTrackers.get(modelUrl)!.dispose();
		this._modelTrackers.delete(modelUrl);
	}