Add temp registerSearchProvider stub

to avoid breaking live share in Insiders

src/vs/vscode.proposed.d.ts

@@ -225,6 +225,11 @@ declare module 'vscode' {
 	}
 
 	export namespace workspace {
+		/**
+		 * DEPRECATED
+		 */
+		export function registerSearchProvider(): Disposable;
+
 		/**
 		 * Register a search provider.
 		 *

src/vs/workbench/api/node/extHost.api.impl.ts

@@ -585,6 +585,10 @@ export function createApiFactory(
 			registerFileSearchProvider: proposedApiFunction(extension, (scheme, provider) => {
 				return extHostSearch.registerFileSearchProvider(scheme, provider);
 			}),
+			registerSearchProvider: proposedApiFunction(extension, () => {
+				// Temp for live share in Insiders
+				return { dispose: () => { } };
+			}),
 			registerTextSearchProvider: proposedApiFunction(extension, (scheme, provider) => {
 				return extHostSearch.registerTextSearchProvider(scheme, provider);
 			}),