Rudimentary autocomplete focus

App/Browser View/BrowserViewController.swift

@@ -54,6 +54,8 @@ class BrowserViewController: UIViewController
     
     override var preferredStatusBarStyle: UIStatusBarStyle { .lightContent }
     
+    internal var changingFocusToAutocompleteController = false
+    
     init() {
         self.tab = tabController.tabs.first!
         self.tabBarViewController = TabBarViewController(tabController: tabController)
@@ -198,6 +200,7 @@ class BrowserViewController: UIViewController
         }), for: .touchUpInside)
         
         // TextField delegate
+        toolbarController.urlBar.delegate = self
         toolbarController.urlBar.textField.delegate = self
         
         // Autocomplete controller
@@ -551,7 +554,9 @@ extension BrowserViewController: UITextFieldDelegate
     }
     
     func textFieldDidEndEditing(_ textField: UITextField) {
-        autocompleteViewController.view.isHidden = true
+        if !changingFocusToAutocompleteController {
+            autocompleteViewController.view.isHidden = true
+        }
     }
 }
 
@@ -561,3 +566,12 @@ extension BrowserViewController: ReaderViewControllerDelegate
         tab.beginLoadingURL(navigationURL)
     }
 }
+
+extension BrowserViewController: URLBarDelegate
+{
+    func urlBarRequestedFocusEscape(_ urlBar: URLBar) {
+        changingFocusToAutocompleteController = true
+            _ = self.autocompleteViewController.becomeFirstResponder()
+        changingFocusToAutocompleteController = false
+    }
+}