I found this post today. After implementing the suggestion, I found that 
just delaying the rest of the update works as expected, viz:

    selectionModel.addSelectionChangeHandler(new 
SelectionChangeEvent.Handler() {
        @Override
        public void onSelectionChange(SelectionChangeEvent event) {
        com.google.gwt.core.client.Scheduler.get().scheduleDeferred(new 
ScheduledCommand() {
            @Override
            public void execute() {
            
getUiHandlers().onActivityDelete(selectionModel.getSelectedObject());
            }
        });
        }
    });
given
final SingleSelectionModel<Activity> selectionModel
and
uiHandlers
is from gwt-presenter framework.

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