add a comment of annoying Chrome crash for future developers, fix lint

Author: wxiaoguang

web_src/js/features/aria.js

@@ -91,7 +91,7 @@ function attachOneDropdownAria($dropdown) {
 
     // if there is an active item, use it (the user is navigating between items)
     // otherwise use the "selected" for combobox (for the last selected item)
-    let $active = $menu.find('> .item.active, > .item.selected');
+    const $active = $menu.find('> .item.active, > .item.selected');
 
     // if there is an active item, use its id. if no active item or the dropdown is used as menu and is hidden, empty the active item
     const activeId = $active.attr('id');

web_src/js/features/common-global.js

@@ -91,6 +91,8 @@ export function initGlobalCommon() {
   const $uiDropdowns = $('.ui.dropdown');
 
   // do not init "custom" dropdowns, "custom" dropdowns are managed by their own code.
+  // NOTICE: some old Android Chrome browsers has a crash bug, this line triggers the bug,
+  //   the browser crashes when users click the Issue Reaction Menu button ("return" before this line, no crash. after, crash)
   $uiDropdowns.filter(':not(.custom)').dropdown({fullTextSearch: 'exact'});
 
   // The "jump" means this dropdown is mainly used for "menu" purpose,