Mark conversation as read on movement

src/conversation-list/conversation-list-view.vala

@@ -3,13 +3,13 @@ using Gtk;
 
 public class ConversationListView : Adw.Bin
 {
+    public ConversationListModel conversation_model { get; private set; }
     public signal void conversation_selected(Conversation conversation);
 
     private Adw.ToolbarView container;
     private ListBox list_box;
     private ScrolledWindow scrolled_window;
     private Adw.HeaderBar header_bar;
-    private ConversationListModel conversation_model;
 
     private string? selected_conversation_guid = null;
     private bool selection_update_queued = false;