Add popup to hashed comments/pull requests/issues in file editing/adding preview tab (#24040)

#23734 didn't add popups(tippy) to ref issues for the preview tab when
adding/editing a file

The location of the preview tab:
<img width="1214" alt="截屏2023-04-10 13 55 38"
src="https://user-images.githubusercontent.com/17645053/230836213-a73f0cee-378c-4a21-93db-583ba2c72f77.png">

This PR resues the logic in `ComboMarkdownEditor.js` to also add popup
to hashed comments/pull requests/issues in file editing/adding preview
tab.

After - On hover:
<img width="1222" alt="截屏2023-04-10 13 55 42"
src="https://user-images.githubusercontent.com/17645053/230836250-527ca7d0-6ec4-4c68-89ab-4f1b57b09239.png">

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>

Author: 3 people

web_src/js/features/comp/ComboMarkdownEditor.js

@@ -4,10 +4,9 @@ import $ from 'jquery';
 import {attachTribute} from '../tribute.js';
 import {hideElem, showElem, autosize} from '../../utils/dom.js';
 import {initEasyMDEImagePaste, initTextareaImagePaste} from './ImagePaste.js';
-import {initMarkupContent} from '../../markup/content.js';
 import {handleGlobalEnterQuickSubmit} from './QuickSubmit.js';
-import {attachRefIssueContextPopup} from '../contextpopup.js';
 import {emojiKeys, emojiString} from '../emoji.js';
+import {renderPreviewPanelContent} from '../repo-editor.js';
 
 let elementIdCounter = 0;
 const maxExpanderMatches = 6;
@@ -194,11 +193,7 @@ class ComboMarkdownEditor {
         text: this.value(),
         wiki: this.previewWiki,
       }, (data) => {
-        $panelPreviewer.html(data);
-        initMarkupContent();
-
-        const refIssues = $panelPreviewer.find('p .ref-issue');
-        attachRefIssueContextPopup(refIssues);
+        renderPreviewPanelContent($panelPreviewer, data);
       });
     });
   }

web_src/js/features/repo-editor.js

@@ -1,8 +1,9 @@
 import $ from 'jquery';
 import {htmlEscape} from 'escape-goat';
-import {initMarkupContent} from '../markup/content.js';
 import {createCodeEditor} from './codeeditor.js';
 import {hideElem, showElem} from '../utils/dom.js';
+import {initMarkupContent} from '../markup/content.js';
+import {attachRefIssueContextPopup} from './contextpopup.js';
 
 const {csrfToken} = window.config;
 
@@ -28,8 +29,7 @@ function initEditPreviewTab($form) {
         file_path: treePathEl.val(),
       }, (data) => {
         const $previewPanel = $form.find(`.tab[data-tab="${$tabMenu.data('preview')}"]`);
-        $previewPanel.html(data);
-        initMarkupContent();
+        renderPreviewPanelContent($previewPanel, data);
       });
     });
   }
@@ -191,3 +191,11 @@ export function initRepoEditor() {
     });
   })();
 }
+
+export function renderPreviewPanelContent($panelPreviewer, data) {
+  $panelPreviewer.html(data);
+  initMarkupContent();
+
+  const refIssues = $panelPreviewer.find('p .ref-issue');
+  attachRefIssueContextPopup(refIssues);
+}