Validate python when nb opened not on extension activates (#11087)

For #10893

Author: DonJayamanne

news/2 Fixes/10893.md

@@ -0,0 +1 @@
+Performa validation of interpreter only when a Notebook is opened instead of when extension activates.

src/client/datascience/activation.ts

@@ -28,19 +28,21 @@ export class Activation implements IExtensionSingleActivationService {
     public async activate(): Promise<void> {
         this.disposables.push(this.notebookEditorProvider.onDidOpenNotebookEditor(this.onDidOpenNotebookEditor, this));
         this.disposables.push(this.jupyterInterpreterService.onDidChangeInterpreter(this.onDidChangeInterpreter, this));
-        // Warm up our selected interpreter for the extension
-        this.jupyterInterpreterService.setInitialInterpreter().ignoreErrors();
         this.contextService.activate().ignoreErrors();
     }
 
     private onDidOpenNotebookEditor(_: INotebookEditor) {
         this.notebookOpened = true;
         this.PreWarmDaemonPool().ignoreErrors();
         sendTelemetryEvent(Telemetry.OpenNotebookAll);
+        // Warm up our selected interpreter for the extension
+        this.jupyterInterpreterService.setInitialInterpreter().ignoreErrors();
     }
 
     private onDidChangeInterpreter() {
         if (this.notebookOpened) {
+            // Warm up our selected interpreter for the extension
+            this.jupyterInterpreterService.setInitialInterpreter().ignoreErrors();
             this.PreWarmDaemonPool().ignoreErrors();
         }
     }