Use ProviderResult for search providers

src/vs/vscode.proposed.d.ts

@@ -228,7 +228,7 @@ declare module 'vscode' {
 		 * @param options A set of options to consider while searching.
 		 * @param token A cancellation token.
 		 */
-		provideFileIndex(options: FileIndexOptions, token: CancellationToken): Thenable<Uri[]>;
+		provideFileIndex(options: FileIndexOptions, token: CancellationToken): ProviderResult<Uri[]>;
 	}
 
 	/**
@@ -250,7 +250,7 @@ declare module 'vscode' {
 		 * @param progress A progress callback that must be invoked for all results.
 		 * @param token A cancellation token.
 		 */
-		provideFileSearchResults(query: FileSearchQuery, options: FileSearchOptions, token: CancellationToken): Thenable<Uri[]>;
+		provideFileSearchResults(query: FileSearchQuery, options: FileSearchOptions, token: CancellationToken): ProviderResult<Uri[]>;
 	}
 
 	/**
@@ -264,7 +264,7 @@ declare module 'vscode' {
 		 * @param progress A progress callback that must be invoked for all results.
 		 * @param token A cancellation token.
 		 */
-		provideTextSearchResults(query: TextSearchQuery, options: TextSearchOptions, progress: Progress<TextSearchResult>, token: CancellationToken): Thenable<TextSearchComplete>;
+		provideTextSearchResults(query: TextSearchQuery, options: TextSearchOptions, progress: Progress<TextSearchResult>, token: CancellationToken): ProviderResult<TextSearchComplete>;
 	}
 
 	/**