test: Added double click to open tab test, b=(no-bug), c=tabs, workspaces, tests

src/browser/components/tabbrowser/content/tabs-js.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/components/tabbrowser/content/tabs.js b/browser/components/tabbrowser/content/tabs.js
-index ef9c0389ec926e6bc01c0dc3b883beceaf1f7d43..f7b8ce70fc77d5e00cc066f203609a42083789d5 100644
+index ef9c0389ec926e6bc01c0dc3b883beceaf1f7d43..045864f229327e46812eaa77925988608125fa70 100644
 --- a/browser/components/tabbrowser/content/tabs.js
 +++ b/browser/components/tabbrowser/content/tabs.js
 @@ -83,7 +83,7 @@
@@ -24,7 +24,7 @@ index ef9c0389ec926e6bc01c0dc3b883beceaf1f7d43..f7b8ce70fc77d5e00cc066f203609a42
        if (
          event.button != 0 ||
 -        event.target != this.arrowScrollbox ||
-+        event.target != document.getElementById("zen-tabs-wrapper") ||
++        !event.target.closest(".zen-workspace-normal-tabs-section") ||
          event.composedTarget.localName == "toolbarbutton"
        ) {
          return;

src/zen/tests/workspaces/browser.toml

@@ -5,3 +5,4 @@ support-files = [
 
 ["browser_basic_workspaces.js"]
 ["browser_workspace_bookmarks.js"]
+["browser_double_click_newtab.js"]

src/zen/tests/workspaces/browser_double_click_newtab.js

@@ -0,0 +1,14 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Check_Creation() {
+  const placeToDoubleClick = gZenWorkspaces.activeWorkspaceStrip;
+  EventUtils.sendMouseEvent({ type: 'dblclick' }, placeToDoubleClick, window);
+  await TestUtils.waitForCondition(() => gBrowser.tabs.length === 3, 'New tab should be opened.');
+
+  ok(true, 'New tab should be opened.');
+  await BrowserTestUtils.removeTab(gBrowser.tabs[2]);
+  ok(gBrowser.tabs.length === 2, 'There should be one tab.');
+});