gh-13133: Add Duplicate tab keyboard shortcut (gh-13123)

Co-authored-by: mr. m <91018726+mr-cheffy@users.noreply.github.com>

locales/en-US/browser/browser/preferences/zen-preferences.ftl

@@ -357,3 +357,4 @@ zen-devtools-toggle-dom-shortcut = Toggle DOM
 zen-devtools-toggle-accessibility-shortcut = Toggle Accessibility
 zen-close-all-unpinned-tabs-shortcut = Close All Unpinned Tabs
 zen-new-unsynced-window-shortcut = New Blank Window
+zen-duplicate-tab-shortcut = Duplicate Tab

src/browser/base/content/zen-commands.inc.xhtml

@@ -66,4 +66,6 @@
   <command id="cmd_zenNewNavigatorUnsynced" />
 
   <command id="cmd_zenNewLiveFolder" />
+
+  <command id="cmd_zenDuplicateTab" />
 </commandset>

src/zen/common/zen-sets.js

@@ -143,6 +143,14 @@ document.addEventListener(
             ZenLiveFoldersManager.handleEvent(event);
             break;
           }
+          case "cmd_zenDuplicateTab": {
+            const selectedTabs = gBrowser.selectedTabs;
+            let insertAt = selectedTabs.at(-1)._tPos + 1;
+            for (const tab of selectedTabs) {
+              gBrowser.duplicateTab(tab, true, { tabIndex: insertAt++ });
+            }
+            break;
+          }
           default:
             gZenGlanceManager.handleMainCommandSet(event);
             if (event.target.id.startsWith("cmd_zenWorkspaceSwitch")) {

src/zen/kbs/ZenKeyboardShortcuts.mjs

@@ -832,7 +832,7 @@ class nsZenKeyboardShortcutsLoader {
 }
 
 class nsZenKeyboardShortcutsVersioner {
-  static LATEST_KBS_VERSION = 16;
+  static LATEST_KBS_VERSION = 17;
 
   constructor() {}
 
@@ -1196,6 +1196,22 @@ class nsZenKeyboardShortcutsVersioner {
       }
     }
 
+    if (version < 17) {
+      // Migrate from version 16 to 17.
+      // Add shortcut to Duplicate Tab
+      data.push(
+        new KeyShortcut(
+          "zen-duplicate-tab",
+          "",
+          "",
+          "windowAndTabManagement",
+          nsKeyShortcutModifiers.fromObject({}),
+          "cmd_zenDuplicateTab",
+          "zen-duplicate-tab-shortcut"
+        )
+      );
+    }
+
     return data;
   }
 }