Bug 1731050 - Stop displaying hidden tabs in Recent Tabs popup. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D134939

browser/base/content/browser-ctrlTab.js

@@ -575,6 +575,13 @@ var ctrlTab = {
           this.removeClosingTabFromUI(event.target);
         }
         break;
+      case "TabHide":
+        this.detachTab(event.target);
+        break;
+      case "TabShow":
+        this.attachTab(event.target);
+        this._sortRecentlyUsedTabs();
+        break;
       case "keydown":
         this.onKeyDown(event);
         break;
@@ -640,11 +647,17 @@ var ctrlTab = {
 
     aCallback(urls);
   },
-
+  _sortRecentlyUsedTabs() {
+    this._recentlyUsedTabs.sort(
+      (tab1, tab2) => tab2.lastAccessed - tab1.lastAccessed
+    );
+  },
   _initRecentlyUsedTabs() {
-    this._recentlyUsedTabs = Array.prototype.filter
-      .call(gBrowser.tabs, tab => !tab.closing)
-      .sort((tab1, tab2) => tab2.lastAccessed - tab1.lastAccessed);
+    this._recentlyUsedTabs = Array.prototype.filter.call(
+      gBrowser.tabs,
+      tab => !tab.closing && !tab.hidden
+    );
+    this._sortRecentlyUsedTabs();
   },
 
   _init: function ctrlTab__init(enable) {
@@ -659,6 +672,8 @@ var ctrlTab = {
     tabContainer[toggleEventListener]("TabAttrModified", this);
     tabContainer[toggleEventListener]("TabSelect", this);
     tabContainer[toggleEventListener]("TabClose", this);
+    tabContainer[toggleEventListener]("TabHide", this);
+    tabContainer[toggleEventListener]("TabShow", this);
 
     if (enable) {
       Services.els.addSystemEventListener(document, "keydown", this, false);

browser/base/content/test/general/browser_ctrlTab.js

@@ -143,6 +143,43 @@ add_task(async function() {
     );
   }
 
+  // eslint-disable-next-line no-lone-blocks
+  {
+    // Bug 1731050: test hidden tabs
+    info("Starting hidden tabs test");
+    checkTabs(1);
+    await BrowserTestUtils.addTab(gBrowser);
+    await BrowserTestUtils.addTab(gBrowser);
+    await BrowserTestUtils.addTab(gBrowser);
+    await BrowserTestUtils.addTab(gBrowser);
+
+    selectTabs([1, 2, 3, 4, 3]);
+    gBrowser.hideTab(gBrowser.tabs[4]);
+    selectTabs([2]);
+    gBrowser.hideTab(gBrowser.tabs[3]);
+
+    is(gBrowser.tabs[4].hidden, true, "Tab at index 4 is hidden");
+    is(gBrowser.tabs[3].hidden, true, "Tab at index 3 is hidden");
+    is(gBrowser.tabs[2].hidden, false, "Tab at index 2 is still shown");
+    is(gBrowser.tabs[1].hidden, false, "Tab at index 1 is still shown");
+    is(gBrowser.tabs[0].hidden, false, "Tab at index 0 is still shown");
+
+    await ctrlTabTest([], 1, 1);
+    await ctrlTabTest([], 2, 0);
+    gBrowser.showTab(gBrowser.tabs[4]);
+    await ctrlTabTest([2], 3, 4);
+    await ctrlTabTest([], 5, 4);
+    gBrowser.showTab(gBrowser.tabs[3]);
+    await ctrlTabTest([], 4, 3);
+    await ctrlTabTest([], 6, 4);
+
+    await BrowserTestUtils.removeTab(gBrowser.tabs[4]);
+    await BrowserTestUtils.removeTab(gBrowser.tabs[3]);
+    await BrowserTestUtils.removeTab(gBrowser.tabs[2]);
+    await BrowserTestUtils.removeTab(gBrowser.tabs[1]);
+    info("End hidden tabs test");
+  }
+
   /* private utility functions */
 
   function pressCtrlTab(aShiftKey) {