Ensure event handler is bound to the right context (#9705)

* Ensure event handler is bound to the right context
* News
* Oops

Author: DonJayamanne

news/2 Fixes/9539.md

@@ -0,0 +1 @@
+Ensure event handler is bound to the right context.

src/client/datascience/interactive-common/interactiveBase.ts

@@ -1100,7 +1100,7 @@ export abstract class InteractiveBase extends WebViewHost<IInteractiveWindowMapp
                 }
             };
             this._notebook.onSessionStatusChanged(statusChangeHandler);
-            this._notebook.onKernelChanged(this.kernelChangeHandler);
+            this.disposables.push(this._notebook.onKernelChanged(this.kernelChangeHandler, this));
         }
 
         traceInfo('Connected to jupyter server.');