Close setup webview when all actions have been completed (#2968)

Author: mattseddon

extension/src/getStarted/webview/messages.ts

@@ -38,6 +38,7 @@ export class WebviewMessages {
       return this.initializeProject()
     }
     if (message.type === MessageFromWebviewType.OPEN_EXPERIMENTS_WEBVIEW) {
+      this.getWebview()?.dispose()
       return this.openExperiments()
     }
     Logger.error(`Unexpected message: ${JSON.stringify(message)}`)

extension/src/test/suite/getStarted/index.test.ts

@@ -57,6 +57,8 @@ suite('GetStarted Test Suite', () => {
         type: MessageFromWebviewType.OPEN_EXPERIMENTS_WEBVIEW
       })
 
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      expect((webview as any).disposer.disposed).to.be.true
       expect(mockOpenExperiments).to.be.calledOnce
     }).timeout(WEBVIEW_TEST_TIMEOUT)