src/vs/workbench/services/search/common/fileSearchManager.ts/FileSearchManager/rawMatchToSearchItem
class FileSearchManager:	private rawMatchToSearchItem(match: IInternalFileMatch): IFileMatch {
		if (match.relativePath) {
			return {
				resource: resources.joinPath(match.base, match.relativePath)
			};
		} else {
			// extraFileResources
			return {
				resource: match.base
			};
		}
	}