ok, let you change the name if you're not actually changing it :p

Author: laurelfan

dashboard/app/controllers/levels_controller.rb

@@ -86,7 +86,9 @@ def update_blocks
   # PATCH/PUT /levels/1
   # PATCH/PUT /levels/1.json
   def update
-    if level_params[:name] && @level.name.downcase == level_params[:name].downcase
+    if level_params[:name] &&
+        @level.name != level_params[:name] &&
+        @level.name.downcase == level_params[:name].downcase
       # do not allow case-only changes in the level name because that confuses git on OSX
       @level.errors.add(:name, 'Cannot change only the capitalization of the level name (it confuses git on OSX)')
       render json: @level.errors, status: :unprocessable_entity

dashboard/test/controllers/levels_controller_test.rb

@@ -464,6 +464,21 @@ class LevelsControllerTest < ActionController::TestCase
     assert_equal 'original name', level.name
   end
 
+  test 'no error message when not actually changing level name' do
+    level = create :level, name: 'original name'
+
+    post :update, id: level.id, level: {name: 'original name'}
+
+    assert_response 200
+
+    # no error message
+    assert assigns(:level).errors[:name].blank?
+
+    level = level.reload
+    # same name
+    assert_equal 'original name', level.name
+  end
+
   test 'can update level name' do
     level = create :level, name: 'original name'