mark next steps to address

- error handling
 - settle MutationMessage

src/gui/ctrl/ui-dispatcher.hpp

@@ -110,7 +110,7 @@ namespace ctrl {
         {
           dispatcher_.connect(
                       [this]() {
-                                 queue_.invoke();
+                                 queue_.invoke();    /////////////////////TICKET #1098 : ensure no exception escapes from here!!
                                });
         }
       

src/gui/notification-service.cpp

@@ -113,7 +113,7 @@ namespace gui {
   void
   NotificationService::mutate (ID uiElement, DiffMessage&& diff)
   {
-    dispatch_->event ([=]()
+    dispatch_->event ([=]()                                                  //////////////////////////////////TODO care for error handling!!!
                       {
                         MutationMessage diffHolder{DiffMessage(diff)};       //////////////////////////////////TICKET #1066 : unnecessary repackaging; could get rid of MutationMessage altogether
                         this->change (uiElement, diffHolder);