message: Remove the unnecessary portMapping property.
diff: @@ -231,8 +231,7 @@ export class Viewer {
  const htmlContent = await this.getPDFViewerContent(pdfFilePath)
  const panel = vscode.window.createWebviewPanel('latex-workshop-pdf', path.basename(pdfFilePath), viewColumn, {
  enableScripts: true,
  - retainContextWhenHidden: true,
  - portMapping : [{webviewPort: this.extension.server.port, extensionHostPort: this.extension.server.port}]
  + retainContextWhenHidden: true
  })
  panel.webview.html = htmlContent
  const pdfPanel = new PdfViewerPanel(pdfFilePath, panel)
  