message: Fix Ctrl click to open documentclass file
  Note that this only works if the file defining the class is located in
  the same directory as the rootFile.
diff: @@ -18,11 +18,16 @@ export class DefinitionProvider implements vscode.DefinitionProvider {
  const escapedToken = utils.escapeRegExp(token)
  const regexInput = new RegExp(`\\\\(?:include|input|subfile)\\{${escapedToken}\\}`)
  const regexImport = new RegExp(`\\\\(?:sub)?(?:import|includefrom|inputfrom)\\*?\\{([^\\}]*)\\}\\{${escapedToken}\\}`)
  + const regexDocumentclass = new RegExp(`\\\\(?:documentclass)(?:\\[[^[]]*\\])?\\{${escapedToken}\\}`)
  if (! vscode.window.activeTextEditor) {
  return undefined
  }
  + if (line.match(regexDocumentclass)) {
  + return utils.resolveFile([path.dirname(vscode.window.activeTextEditor.document.fileName)], token, '.cls')
  + }
  +
  let dirs: string[] = []
  if (line.match(regexInput)) {
  dirs = [path.dirname(vscode.window.activeTextEditor.document.fileName)]
  