Set focus on search box when select page visible

Author: jcansdale

src/GitHub.VisualStudio.UI/Views/Dialog/Clone/SelectPageView.xaml.cs

@@ -1,6 +1,8 @@
-using System.ComponentModel.Composition;
+using System;
+using System.ComponentModel.Composition;
 using System.Windows.Controls;
 using System.Windows.Input;
+using System.Windows.Threading;
 using GitHub.Exports;
 using GitHub.ViewModels.Dialog.Clone;
 
@@ -13,6 +15,16 @@ public partial class SelectPageView : UserControl
         public SelectPageView()
         {
             InitializeComponent();
+
+            // See Douglas Stockwell's suggestion here:
+            // https://social.msdn.microsoft.com/Forums/vstudio/en-US/30ed27ce-f7b7-48ae-8adc-0400b9b9ec78
+            IsVisibleChanged += (sender, e) =>
+            {
+                if (IsVisible)
+                {
+                    Dispatcher.BeginInvoke(DispatcherPriority.Input, (Action)(() => SearchTextBox.Focus()));
+                }
+            };
         }
 
         protected override void OnPreviewMouseDown(MouseButtonEventArgs e)