Fix and fine tune "Report a filter issue" page

Related feedback:
- https://github.com/uBlockOrigin/uBlock-issues/discussions/2619

src/css/support.css

@@ -86,6 +86,10 @@ span[data-url] {
     cursor: pointer;
     }
 
+#showSupportInfo {
+    cursor: pointer;
+    }
+
 body.redacted #redactButton {
     display: none;
     }

src/js/support.js

@@ -282,7 +282,7 @@ uBlockDashboard.patchCodeMirrorEditor(cmEditor);
 
     if ( reportedPage !== null ) {
         if ( dom.cl.has(dom.body, 'shouldUpdate') ) {
-            dom.on('.shouldUpdate button', 'click', ev => {
+            dom.on('.supportEntry.shouldUpdate button', 'click', ev => {
                 updateFilterLists();
                 ev.preventDefault();
             });
@@ -304,7 +304,7 @@ uBlockDashboard.patchCodeMirrorEditor(cmEditor);
         });
 
         dom.on('#showSupportInfo', 'click', ev => {
-            const button = ev.target;
+            const button = ev.target.closest('#showSupportInfo');
             dom.cl.add(button, 'hidden');
             dom.cl.add('.a.b.c.d', 'e');
             cmEditor.refresh();
@@ -312,10 +312,15 @@ uBlockDashboard.patchCodeMirrorEditor(cmEditor);
     }
 
     vAPI.broadcastListener.add(msg => {
-        if ( msg.what !== 'staticFilteringDataChanged' ) { return; }
-        showSupportData();
+        if ( msg.what === 'assetsUpdated' ) {
             dom.cl.remove(dom.body, 'updating');
             dom.cl.add(dom.body, 'updated');
+            return;
+        }
+        if ( msg.what === 'staticFilteringDataChanged' ) {
+            showSupportData();
+            return;
+        }
     });
 
     dom.on('#selectAllButton', 'click', ( ) => {

src/support.html

@@ -101,7 +101,7 @@
             <button type="button" data-i18n="supportReportSpecificButton" class="preferred">_<span class="hover"></span></button>
         </div>
         <hr>
-        <h3 id="showSupportInfo" class="subtil" data-i18n="supportS5H">_</h3>
+        <h3 id="showSupportInfo" class="subtil" data-i18n="supportS5H">_<span>&nbsp;&#x25b8;</span></h3>
     </div>
     <div class="a b c d">
         <h3 data-i18n="supportS5H"></h3>