cached changelog (fix #113)

Author: maxijabase

UI/MainWindow/MainWindowMenuHandler.cs

@@ -294,7 +294,7 @@ await this.ShowMessageAsync(Program.Translations.Get("FailedCheck"),
                     var message = string.Format(Program.Translations.Get("VersionYour"),
                             VersionHelper.GetAssemblyVersion());
 #endif
-                    await this.ShowMessageAsync(Program.Translations.Get("VersUpToDate"), 
+                    await this.ShowMessageAsync(Program.Translations.Get("VersUpToDate"),
                         message, MessageDialogStyle.Affirmative, MetroDialogOptions);
                 }
             }
@@ -305,7 +305,10 @@ private async void Changelog_Click(object sender, RoutedEventArgs e)
             var dialog = await this.ShowProgressAsync("Retrieving changelog...", "Please wait...");
             dialog.SetIndeterminate();
 
-            await UpdateCheck.Check();
+            if (Program.UpdateStatus.AllReleases == null)
+            {
+                await UpdateCheck.Check();
+            }
             var status = Program.UpdateStatus;
 
             await dialog.CloseAsync();
@@ -327,9 +330,9 @@ private void MenuButton_Action(object sender, RoutedEventArgs e)
                 case 2: Server_Start(); break;
             }
         }
-#endregion
+        #endregion
 
-#region Methods
+        #region Methods
         /// <summary>
         /// Loads the input gesture texts to the menu items.
         /// </summary>
@@ -448,6 +451,6 @@ private MenuItem BuildRecentFileItem(string file)
             // Return the MenuItem
             return mi;
         }
-#endregion
+        #endregion
     }
 }