Always disable on stable build

src/vs/workbench/services/workspace/node/workspaceEditingService.ts

@@ -50,12 +50,11 @@ export class WorkspaceEditingService implements IWorkspaceEditingService {
 	}
 
 	private isSupported(): boolean {
-		if (!this.contextService.hasMultiFolderWorkspace()) {
-			return false; // we need a multi folder workspace to begin with
-		}
-
 		// TODO@Ben multi root
-		return this.environmentService.appQuality !== 'stable'; // not yet enabled in stable
+		return (
+			this.environmentService.appQuality !== 'stable'  // not yet enabled in stable
+			&& this.contextService.hasMultiFolderWorkspace() // we need a multi folder workspace to begin with
+		);
 	}
 
 	private doSetRoots(newRoots: URI[]): TPromise<void> {
@@ -87,4 +86,4 @@ export class WorkspaceEditingService implements IWorkspaceEditingService {
 		const validatedRoots = distinct(roots.map(root => root.toString(true /* skip encoding */)));
 		return validatedRoots;
 	}
-}
\ No newline at end of file
+}