src/vs/editor/browser/services/editorWorkerService.ts/EditorWorkerClient/computeDirtyDiff
class EditorWorkerClient:	public computeDirtyDiff(original: URI, modified: URI, ignoreTrimWhitespace: boolean): Promise<IChange[] | null> {
		return this._withSyncedResources([original, modified]).then(proxy => {
			return proxy.computeDirtyDiff(original.toString(), modified.toString(), ignoreTrimWhitespace);
		});
	}