File picker: bypass exclude rules when picking a full file path (fixes #1445)

src/vs/workbench/services/search/node/fileSearch.ts

@@ -67,6 +67,14 @@ export class FileWalker {
 		// Reset state
 		this.resetState();
 
+		// Support that the file pattern is a full path to a file that exists
+		this.checkFilePatternMatch(rootPaths, (exists) => {
+
+			// Report result from file pattern if matching
+			if (exists) {
+				onResult({ path: this.filePattern });
+			}
+
 			// For each source
 			flow.parallel(rootPaths, (absolutePath, perEntryCallback) => {
 
@@ -111,6 +119,21 @@ export class FileWalker {
 			}, (err, result) => {
 				done(err ? err[0] : null, this.isLimitHit);
 			});
+		});
+	}
+
+	private checkFilePatternMatch(rootPaths: string[], clb: (exists: boolean) => void): void {
+		if (!this.filePattern || !paths.isAbsolute(this.filePattern)) {
+			return clb(false);
+		}
+
+		if (rootPaths && rootPaths.some(r => r === this.filePattern)) {
+			return clb(false); // root paths matches are handled already (prevents duplicates)
+		}
+
+		return fs.stat(this.filePattern, (error, stat) => {
+			return clb(!error && !stat.isDirectory()); // only existing files
+		});
 	}
 
 	private doWalk(absolutePath: string, relativeParentPath: string, files: string[], onResult: (result: ISerializedFileMatch) => void, done: (error: Error, result: any) => void): void {