src/vs/workbench/services/search/node/fileSearch.ts/FileWalker/isFileMatch
class FileWalker:	private isFileMatch(candidate: IRawFileMatch): boolean {
		// Check for search pattern
		if (this.filePattern) {
			if (this.filePattern === '*') {
				return true; // support the all-matching wildcard
			}

			if (this.normalizedFilePatternLowercase) {
				return isFilePatternMatch(candidate, this.normalizedFilePatternLowercase);
			}
		}

		// No patterns means we match all
		return true;
	}