also update default_context_name

New actions are created with the context as defined in
default_context_name. This value needs to be updated as shown in #1789.

app/views/contexts/update.js.erb

@@ -18,7 +18,7 @@ var <%=object_name%> = {
       <% else -%>
         <%=object_name%>.replace_context_form_with_updated_context();
       <% end -%>
-      TracksForm.set_context_name("<%= escape_javascript(@context.name)%>");
+      TracksForm.set_context_name_and_default_context_name("<%= escape_javascript(@context.name)%>");
     },
     remove_and_re_add_context: function() {
       $('#<%=dom_id(@context, 'container')%>').slideUp(500, function() {

features/context_edit.feature

@@ -28,6 +28,14 @@ Feature: Edit a context
     And I edit the context name in place to be "OutAndAbout"
     Then the context field of the new todo form should contain "OutAndAbout"
 
+  # Ticket #1789
+  @javascript
+  Scenario: I can change the name of the context and it should still allow me to add new actions
+    When I go to the context page for "@pc"
+    And I edit the context name in place to be "OutAndAbout"
+    And I submit a new action with description "a new next action"
+    Then I should see the todo "a new next action"
+
   @javascript
   Scenario: Editing the context of a todo will remove the todo
     When I go to the the context page for "@pc"

features/step_definitions/context_steps.rb

@@ -54,6 +54,7 @@ When /^I edit the context name in place to be "([^\"]*)"$/ do |new_context_name|
   page.find("span#context_name").click
   fill_in "value", :with => new_context_name
   click_button "Ok"
+  wait_for_ajax
 end
 
 Then /^I should see the context name is "([^\"]*)"$/ do |context_name|