update form with new context name

app/assets/javascripts/tracks.js.erb

@@ -659,7 +659,7 @@ var ContextListPage = {
         $.post(relative_to_root('contexts/'+context_id), {
             'context[name]': value,
             '_method': 'put'
-        }, highlight);
+        }, highlight, 'script');
         return value;
     },
     setup_behavior: function() {

app/views/contexts/update.js.erb

@@ -18,6 +18,7 @@ var <%=object_name%> = {
       <% else -%>
         <%=object_name%>.replace_context_form_with_updated_context();
       <% end -%>
+      TracksForm.set_context_name("<%= escape_javascript(@context.name)%>");
     },
     remove_and_re_add_context: function() {
       $('#<%=dom_id(@context, 'container')%>').slideUp(500, function() {

features/context_edit.feature

@@ -21,6 +21,13 @@ Feature: Edit a context
     Then I should see that a context named "Errands" is not present
     And I should see that a context named "OutAndAbout" is present
 
+  # Ticket #1796
+  @javascript
+  Scenario: I can change the name of the context and it should update the new todo form
+    When I go to the context page for "@pc"
+    And I edit the context name in place to be "OutAndAbout"
+    Then the context field of the new todo form should contain "OutAndAbout"
+
   @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/todo_steps.rb

@@ -119,6 +119,11 @@ Then /^the project field of the new todo form should contain "([^"]*)"$/ do |pro
   expect(project_name).to eq(page.find(:xpath, xpath).value)
 end
 
+Then /^the context field of the new todo form should contain "([^"]*)"$/ do |context_name|
+  xpath= "//form[@id='todo-form-new-action']/input[@id='todo_context_name']"
+  expect(page.find(:xpath, xpath).value).to eq(context_name)
+end
+
 Then /^the default context of the new todo form should be "([^"]*)"$/ do |context_name|
   xpath= "//form[@id='todo-form-new-action']/input[@id='todo_context_name']"
   expect(context_name).to eq(page.find(:xpath, xpath).value)