Tab Bar: Adds tab bar view/view controller

App/Tabs/TabController.swift

@@ -9,7 +9,9 @@ import Foundation
 
 class TabController
 {
-    var tabs: [Tab] = []
+    @Published var tabs: [Tab] = []
+    @Published var activeTabIndex: Int = 0
+    
     var policyManager = ResourcePolicyManager()
     
     init() {
@@ -39,6 +41,13 @@ class TabController
     func closeTab(_ tab: Tab) {
         if let index = tabs.firstIndex(of: tab) {
             tabs.remove(at: index)
+            
+            if tabs.count > 0 {
+                activeTabIndex = tabs.count - 1
+            } else {
+                _ = createNewTab(url: nil)
+                activeTabIndex = 0
+            }
         }
     }
 }