Do not clear the selection when creating new replies

The purpose of clearing the selection was to ensure
that the new annotation was immediately visible.

Clearing the selection when creating a reply to
a selected annotation is not necessary because the reply
is part of an already-visible thread.

h/static/scripts/test/widget-controller-test.coffee

@@ -162,3 +162,10 @@ describe 'WidgetController', ->
       $scope.clearSelection = sinon.stub()
       $rootScope.$emit('beforeAnnotationCreated', {$highlight: true})
       assert.notCalled($scope.clearSelection)
+
+    it 'does not clear the selection if the new annotation is a reply', ->
+      $scope.clearSelection = sinon.stub()
+      $rootScope.$emit('beforeAnnotationCreated', {
+        references: ['parent-id']
+      })
+      assert.notCalled($scope.clearSelection)

h/static/scripts/widget-controller.coffee

@@ -74,7 +74,7 @@ module.exports = class WidgetController
       !!($scope.focusedAnnotations ? {})[annotation?.$$tag]
 
     $rootScope.$on('beforeAnnotationCreated', (event, data) ->
-      if data.$highlight
+      if data.$highlight || (data.references && data.references.length > 0)
         return
       $scope.clearSelection()
     )