src/vs/workbench/contrib/search/common/searchModel.ts/FolderMatch/doAdd
class FolderMatch:	private doAdd(fileMatch: FileMatch): void {
		this._fileMatches.set(fileMatch.resource, fileMatch);
		if (this._unDisposedFileMatches.has(fileMatch.resource)) {
			this._unDisposedFileMatches.delete(fileMatch.resource);
		}
	}