message: Fix PR merge title field overflowing
diff: /* Limit width of commit title to 72 characters */
  .rgh-monospace-textareas :is(#merge_title_field, #commit-summary-input) {
  - width: 72ch;
  + /* 12px for the padding and 1px for the border https://user-images.githubusercontent.com/46634000/136789268-442caa39-33bc-4af3-8fb2-9cf6db722127.png */
  + width: calc(72ch + 26px);
  max-width: 100%;
  - box-sizing: content-box;
  }
  .rgh-monospace-textareas :is(#merge_title_field, #commit-summary-input, textarea) {
  