Make the height of the editor in Review Box smaller (4 lines as GitHub) (#18319)

And shrink the height of Dropzone.

web_src/js/features/repo-issue.js

@@ -459,7 +459,9 @@ export function initRepoPullRequestReview() {
   const $reviewBox = $('.review-box');
   if ($reviewBox.length === 1) {
     (async () => {
-      await createCommentEasyMDE($reviewBox.find('textarea'));
+      // the editor's height is too large in some cases, and the panel cannot be scrolled with page now because there is `.repository .diff-detail-box.sticky { position: sticky; }`
+      // the temporary solution is to make the editor's height smaller (about 4 lines). GitHub also only show 4 lines for default. We can improve the UI (including Dropzone area) in future
+      await createCommentEasyMDE($reviewBox.find('textarea'), {minHeight: '80px'});
       initCompImagePaste($reviewBox);
     })();
   }