message: Fix Use detached mode when opening external viewer
diff: @@ -107,7 +107,7 @@ export class Viewer {
  if (command.args) {
  command.args = command.args.map(arg => arg.replace('%PDF%', pdfFile))
  }
  - cp.spawn(command.command, command.args, {cwd: path.dirname(sourceFile)})
  + cp.spawn(command.command, command.args, {cwd: path.dirname(sourceFile), detached: true})
  this.extension.logger.addLogMessage(`Open external viewer for ${pdfFile}`)
  }
  