Rewrite and restyle reaction selector and enable no-sizzle eslint rule (#30453) (#30473)

Backport #30453 by @silverwind

Enable `no-sizzle` lint rule, there was only one use in
`initCompReactionSelector` which I have rewritten as follows:

- Remove all jQuery except the necessary fomantic dropdown init
- Remove the recursion, instead bind event listeners to common parent
container nodes

Did various tests, works with our without attachments, in diff view and
in diff comments inside comment list.

Additionally the style of reactions now matches between code comments
and issue comments:

<img width="275" alt="Screenshot 2024-04-13 at 14 58 10"
src="https://github.com/go-gitea/gitea/assets/115237/9d08f188-8661-4dd9-bff4-cad6d6d09cab">

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/comp/ReactionSelector.js

@@ -1,38 +1,36 @@
 import $ from 'jquery';
 import {POST} from '../../modules/fetch.js';
 
-export function initCompReactionSelector($parent) {
-  $parent.find(`.select-reaction .item.reaction, .comment-reaction-button`).on('click', async function (e) {
-    e.preventDefault();
+export function initCompReactionSelector() {
+  for (const container of document.querySelectorAll('.issue-content, .diff-file-body')) {
+    container.addEventListener('click', async (e) => {
+      // there are 2 places for the "reaction" buttons, one is the top-right reaction menu, one is the bottom of the comment
+      const target = e.target.closest('.comment-reaction-button');
+      if (!target) return;
+      e.preventDefault();
 
-    if (this.classList.contains('disabled')) return;
+      if (target.classList.contains('disabled')) return;
 
-    const actionUrl = this.closest('[data-action-url]')?.getAttribute('data-action-url');
-    const reactionContent = this.getAttribute('data-reaction-content');
-    const hasReacted = this.closest('.ui.segment.reactions')?.querySelector(`a[data-reaction-content="${reactionContent}"]`)?.getAttribute('data-has-reacted') === 'true';
+      const actionUrl = target.closest('[data-action-url]').getAttribute('data-action-url');
+      const reactionContent = target.getAttribute('data-reaction-content');
 
-    const res = await POST(`${actionUrl}/${hasReacted ? 'unreact' : 'react'}`, {
-      data: new URLSearchParams({content: reactionContent}),
+      const commentContainer = target.closest('.comment-container');
+
+      const bottomReactions = commentContainer.querySelector('.bottom-reactions'); // may not exist if there is no reaction
+      const bottomReactionBtn = bottomReactions?.querySelector(`a[data-reaction-content="${CSS.escape(reactionContent)}"]`);
+      const hasReacted = bottomReactionBtn?.getAttribute('data-has-reacted') === 'true';
+
+      const res = await POST(`${actionUrl}/${hasReacted ? 'unreact' : 'react'}`, {
+        data: new URLSearchParams({content: reactionContent}),
+      });
+
+      const data = await res.json();
+      bottomReactions?.remove();
+      if (data.html) {
+        commentContainer.insertAdjacentHTML('beforeend', data.html);
+        const bottomReactionsDropdowns = commentContainer.querySelectorAll('.bottom-reactions .dropdown.select-reaction');
+        $(bottomReactionsDropdowns).dropdown(); // re-init the dropdown
+      }
     });
-
-    const data = await res.json();
-    if (data && (data.html || data.empty)) {
-      const $content = $(this).closest('.content');
-      let $react = $content.find('.segment.reactions');
-      if ((!data.empty || data.html === '') && $react.length > 0) {
-        $react.remove();
-      }
-      if (!data.empty) {
-        const $attachments = $content.find('.segment.bottom:first');
-        $react = $(data.html);
-        if ($attachments.length > 0) {
-          $react.insertBefore($attachments);
-        } else {
-          $react.appendTo($content);
-        }
-        $react.find('.dropdown').dropdown();
-        initCompReactionSelector($react);
-      }
-    }
-  });
+  }
 }

web_src/js/features/repo-diff.js

@@ -80,7 +80,6 @@ function initRepoDiffConversationForm() {
         $(`[data-path="${path}"] .add-code-comment[data-side="${side}"][data-idx="${idx}"]`).addClass('tw-invisible');
       }
       $newConversationHolder.find('.dropdown').dropdown();
-      initCompReactionSelector($newConversationHolder);
     } catch (error) {
       console.error('Error:', error);
       showErrorToast(i18n.network_error);

web_src/js/features/repo-legacy.js

@@ -393,7 +393,7 @@ export function initRepository() {
     initRepoIssueDependencyDelete();
     initRepoIssueCodeCommentCancel();
     initRepoPullRequestUpdate();
-    initCompReactionSelector($(document));
+    initCompReactionSelector();
 
     initRepoPullRequestMergeForm();
     initRepoPullRequestCommitStatus();