message: Add tooltip to display full filename in download manager.
diff: @@ -109,6 +109,7 @@ function createDOM(arg) {
  let h2FileName = document.createElement('h2');
  h2FileName.classList.add('text-cutoff');
  h2FileName.innerHTML = arg.fileName;
  + h2FileName.title = arg.fileName;
  fileNameDiv.appendChild(h2FileName);
  let fileProgressTitle = document.createElement('span');
  