Bug 1849772 - Focus thread tree's table body instead of the tree itself. r=babolivier

Differential Revision: https://phabricator.services.mozilla.com/D186667

--HG--
extra : moz-landing-system : lando

mail/components/unifiedtoolbar/content/items/mail-go-button.mjs

@@ -168,7 +168,7 @@ class MailGoButton extends MailTabButton {
     if (index != nsMsgViewIndex_None) {
       if (currentWindow.threadTree) {
         currentWindow.threadTree.selectedIndex = index;
-        currentWindow.threadTree.focus();
+        currentWindow.threadTree.table.body.focus();
       } else {
         currentWindow.gViewWrapper.dbView.selection.select(index);
         currentWindow.displayMessage(

mail/test/browser/quick-filter-bar/browser_toggleBar.js

@@ -13,6 +13,7 @@ var {
   assert_messages_in_view,
   be_in_folder,
   create_folder,
+  focus_thread_tree,
   get_about_3pane,
   make_message_sets_in_folders,
   mc,
@@ -72,7 +73,7 @@ add_task(async function test_control_shift_k_triggers_display() {
   assert_quick_filter_bar_visible(false);
 
   // focus explicitly on the thread pane so we know where the focus is.
-  get_about_3pane().threadTree.focus();
+  focus_thread_tree();
 
   // hit control-shift-k
   EventUtils.synthesizeKey("k", { accelKey: true, shiftKey: true });

mail/test/browser/shared-modules/FolderDisplayHelpers.jsm

@@ -2598,7 +2598,7 @@ function focus_folder_tree() {
  */
 function focus_thread_tree() {
   let threadTree = get_about_3pane().document.getElementById("threadTree");
-  threadTree.focus();
+  threadTree.table.body.focus();
 }
 
 /**