client: Components.ConversationActions: Update buttons when account updated

- Revert back !783
- Handle update on account setter
- Fix #1198

src/client/application/application-main-window.vala

@@ -1900,7 +1900,6 @@ public class Application.MainWindow :
         );
         this.conversation_list_actions.update_trash_button(show_trash);
         this.conversation_headerbar.full_actions.update_trash_button(show_trash);
-        this.conversation_headerbar.compact_actions.update_trash_button(show_trash);
     }
 
     private async void update_context_dependent_actions(bool sensitive) {

src/client/components/components-conversation-actions.vala

@@ -25,9 +25,18 @@ public class Components.ConversationActions : Gtk.Box {
         }
     }
 
-    public int selected_conversations { get; set; default = 1; }
+    public int selected_conversations { get; set; }
 
-    public Geary.Account account { get; set; }
+    private Geary.Account _account;
+    public Geary.Account account {
+        get {
+            return this._account;
+        }
+        set {
+            this._account = value;
+            this.update_conversation_buttons();
+        }
+    }
 
     [GtkChild] private unowned Gtk.Box response_buttons { get; }
 
@@ -58,7 +67,6 @@ public class Components.ConversationActions : Gtk.Box {
             "mark_message_menu"
         );
 
-        this.update_conversation_buttons();
         this.notify["selected-conversations"].connect(() => update_conversation_buttons());
         this.notify["service-provider"].connect(() => update_conversation_buttons());
         this.mark_message_button.popover = new Gtk.Popover.from_model(null, mark_menu);