message: Correctly skip "dirty" merge title field
  + simply empty it before inserting the new title
diff: @@ -79,9 +79,14 @@ function onMergePanelToggle(event: CustomEvent): void {
  triggerFitTextareas();
  // Replace default title and fire the correct events
  - const field = select<HTMLTextAreaElement>('.merge-branch-form:not(.is-dirty) #merge_title_field')!;
  - field.focus();
  - field.select();
  + const field = select<HTMLTextAreaElement>('#merge_title_field')!;
  +
  + // Only if the user hasn't already interacted with it
  + if (field.closest('.is-dirty')) {
  + return;
  + }
  +
  + field.value = '';
  insertTextTextarea(field, createCommitTitle());
  }
  