disable launcher at root level

Author: DenisaCG

src/plugins/driveBrowserPlugin.ts

@@ -157,6 +157,7 @@ export const driveFileBrowser: JupyterFrontEndPlugin<void> = {
       }
       app.commands.notifyCommandChanged(CommandIDs.createNewDrive);
       app.commands.notifyCommandChanged(CommandIDs.createNewDirectory);
+      app.commands.notifyCommandChanged(CommandIDs.launcher);
     };
 
     // Listen for path changes.

src/plugins/launcherPlugin.ts

@@ -44,6 +44,10 @@ function activate(
   commands.addCommand(CommandIDs.launcher, {
     label: trans.__('New Launcher'),
     icon: args => (args.toolbar ? addIcon : undefined),
+    isEnabled: () => {
+      const currentBrowser = factory?.tracker.currentWidget;
+      return currentBrowser?.model.path !== 's3:';
+    },
     execute: (args: ReadonlyPartialJSONObject) => {
       // get current file browser used
       const currentBrowser = factory?.tracker.currentWidget;