message: Accept roofile without extension in subfiles
  Accept both
  \documentclass[../root]{subfiles}
  \documentclass[../root.tex]{subfiles}
  Related to
diff: @@ -241,11 +241,15 @@ export class Manager {
  if (!vscode.window.activeTextEditor) {
  return undefined
  }
  - const regex = /(?:\\documentclass\[(.*(?:\.tex))\]{subfiles})/
  + const regex = /(?:\\documentclass\[(.*)\]{subfiles})/
  const result = content.match(regex)
  if (result) {
  - const file = path.resolve(path.dirname(vscode.window.activeTextEditor.document.fileName), result[1])
  + const file = utils.resolveFile([path.dirname(vscode.window.activeTextEditor.document.fileName)], result[1])
  + if (file) {
  this.extension.logger.addLogMessage(`Found root file of this subfile from active editor: ${file}`)
  + } else {
  + this.extension.logger.addLogMessage(`Cannot find root file of this subfile from active editor: ${result[1]}`)
  + }
  return file
  }
  return undefined
  