Bug 1633946 - Add tooltip to List All Tabs r=mconley

Differential Revision: https://phabricator.services.mozilla.com/D183102

browser/base/content/test/tabs/browser_tab_tooltips.js

@@ -106,3 +106,43 @@ add_task(async function () {
 
   BrowserTestUtils.removeTab(tab);
 });
+
+// This test verifies that the tooltip in the tab manager panel matches the
+// tooltip in the tab strip.
+add_task(async function () {
+  // Open a new tab
+  const tabUrl = "https://example.com";
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, tabUrl);
+
+  // Make the popup of allTabs showing up
+  gTabsPanel.init();
+  let allTabsView = document.getElementById("allTabsMenu-allTabsView");
+  let allTabsPopupShownPromise = BrowserTestUtils.waitForEvent(
+    allTabsView,
+    "ViewShown"
+  );
+  gTabsPanel.showAllTabsPanel();
+  await allTabsPopupShownPromise;
+
+  // Get tooltips and compare them
+  let tabInPanel = Array.from(
+    gTabsPanel.allTabsViewTabs.querySelectorAll(".all-tabs-button")
+  ).at(-1).label;
+  let tabInTabStrip = tab.getAttribute("label");
+
+  is(
+    tabInPanel,
+    tabInTabStrip,
+    "Tooltip in tab manager panel matches tooltip in tab strip"
+  );
+
+  // Close everything
+  let allTabsPopupHiddenPromise = BrowserTestUtils.waitForEvent(
+    allTabsView.panelMultiView,
+    "PanelMultiViewHidden"
+  );
+  gTabsPanel.hideAllTabsPanel();
+  await allTabsPopupHiddenPromise;
+
+  BrowserTestUtils.removeTab(tab);
+});

browser/modules/TabsList.sys.mjs

@@ -358,11 +358,13 @@ export class TabsPanel extends TabsListBase {
   _setRowAttributes(row, tab) {
     setAttributes(row, { selected: tab.selected });
 
+    let tooltiptext = this.gBrowser.getTabTooltip(tab);
     let busy = tab.getAttribute("busy");
     let button = row.firstElementChild;
     setAttributes(button, {
       busy,
       label: tab.label,
+      tooltiptext,
       image: !busy && tab.getAttribute("image"),
       iconloadingprincipal: tab.getAttribute("iconloadingprincipal"),
     });