fix selection of conversations when activating by notification

Author: Trolldemorted

Signal-Windows/ViewModels/MainPageViewModel.cs

@@ -150,14 +150,10 @@ internal async Task SendMessageButton_Click(TextBox messageTextBox)
 
         public void TrySelectConversation(string conversationId)
         {
-            if (ConversationsDictionary.ContainsKey(conversationId))
+            if (conversationId != null && ConversationsDictionary.ContainsKey(conversationId))
             {
                 SelectedConversation = ConversationsDictionary[conversationId];
             }
-            else
-            {
-                Logger.LogError("TrySelectConversation could not select conversation: key is not present");
-            }
         }
 
         public void ConversationsList_SelectionChanged(object sender, SelectionChangedEventArgs e)
@@ -278,7 +274,6 @@ public void ReplaceConversationList(List<SignalConversation> conversations)
             ConversationsDictionary.Clear();
             Conversations.Clear();
             Conversations.AddRange(conversations);
-
             foreach (var c in Conversations)
             {
                 ConversationsDictionary.Add(c.ThreadId, c);

Signal-Windows/Views/MainPage.xaml.cs

@@ -86,6 +86,7 @@ protected override void OnNavigatedTo(NavigationEventArgs e)
             SwitchToStyle(GetCurrentViewStyle());
             MainPanel.DisplayMode = SplitViewDisplayMode.CompactInline;
             Frame.SizeChanged += Frame_SizeChanged;
+            Vm.TrySelectConversation(Vm.RequestedConversationId);
         }
 
         protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)