Fire active environment change event if selected environment is deleted (#22113)

Closes #22066

Author: Kartik Raj

src/client/interpreter/interpreterService.ts

@@ -85,6 +85,11 @@ export class InterpreterService implements Disposable, IInterpreterService {
 
     private readonly didChangeInterpreterInformation = new EventEmitter<PythonEnvironment>();
 
+    private readonly activeInterpreterPaths = new Map<
+        string,
+        { path: string; workspaceFolder: WorkspaceFolder | undefined }
+    >();
+
     constructor(
         @inject(IServiceContainer) private serviceContainer: IServiceContainer,
         @inject(IComponentAdapter) private readonly pyenvs: IComponentAdapter,
@@ -100,10 +105,12 @@ export class InterpreterService implements Disposable, IInterpreterService {
         const workspaceFolder = this.serviceContainer
             .get<IWorkspaceService>(IWorkspaceService)
             .getWorkspaceFolder(resource);
-        this.ensureEnvironmentContainsPython(
-            this.configService.getSettings(resource).pythonPath,
-            workspaceFolder,
-        ).ignoreErrors();
+        const path = this.configService.getSettings(resource).pythonPath;
+        const workspaceKey = this.serviceContainer
+            .get<IWorkspaceService>(IWorkspaceService)
+            .getWorkspaceFolderIdentifier(resource);
+        this.activeInterpreterPaths.set(workspaceKey, { path, workspaceFolder });
+        this.ensureEnvironmentContainsPython(path, workspaceFolder).ignoreErrors();
     }
 
     public initialize(): void {
@@ -155,6 +162,16 @@ export class InterpreterService implements Disposable, IInterpreterService {
                 const interpreter = e.old ?? e.new;
                 if (interpreter) {
                     this.didChangeInterpreterInformation.fire(interpreter);
+                    for (const { path, workspaceFolder } of this.activeInterpreterPaths.values()) {
+                        if (path === interpreter.path && !e.new) {
+                            // If the active environment got deleted, notify it.
+                            this.didChangeInterpreterEmitter.fire(workspaceFolder?.uri);
+                            reportActiveInterpreterChanged({
+                                path,
+                                resource: workspaceFolder,
+                            });
+                        }
+                    }
                 }
             }),
         );
@@ -246,6 +263,10 @@ export class InterpreterService implements Disposable, IInterpreterService {
                 path: pySettings.pythonPath,
                 resource: workspaceFolder,
             });
+            const workspaceKey = this.serviceContainer
+                .get<IWorkspaceService>(IWorkspaceService)
+                .getWorkspaceFolderIdentifier(resource);
+            this.activeInterpreterPaths.set(workspaceKey, { path: pySettings.pythonPath, workspaceFolder });
             const interpreterDisplay = this.serviceContainer.get<IInterpreterDisplay>(IInterpreterDisplay);
             interpreterDisplay.refresh().catch((ex) => traceError('Python Extension: display.refresh', ex));
             await this.ensureEnvironmentContainsPython(this._pythonPathSetting, workspaceFolder);