Add two TODO notes about where the tab aria-selected state might need…

… to be updated.

packages/widgets/src/tabbar.ts

@@ -1018,6 +1018,9 @@ class TabBar<T> extends Widget {
     let ci = this._currentIndex;
     let bh = this.insertBehavior;
 
+
+    // TODO: do we need to do an update to update the aria-selected attribute?
+
     // Handle the behavior where the new tab is always selected,
     // or the behavior where the new tab is selected if needed.
     if (bh === 'select-tab' || (bh === 'select-tab-if-needed' && ci === -1)) {
@@ -1071,6 +1074,8 @@ class TabBar<T> extends Widget {
       return;
     }
 
+    // TODO: do we need to do an update to adjust the aria-selected value?
+
     // No tab gets selected if the tab bar is empty.
     if (this._titles.length === 0) {
       this._currentIndex = -1;