Merge branch 'line-is-wrong-test' into 'master'

Make test element selection more specific to fix constantly failing test.

Fixes #2051.

The problem was that there were two `.note-text` elements matching `.files [id^=diff]:nth-child(2) .note-text`, one for the new comment, and one for the (currently hidden) new comment form. The latter one was selected but currently invisible, triggering the following error in poltergeist:

> The element you are trying to interact with is either not part of the DOM, or is not currently visible on the page (perhaps display: none is set). It's possible the element has been replaced by another element and you meant to interact with the new element. If so you need to do a new 'find' in order to get a reference to the new element.

This caused the test to fail.

See merge request !1592

features/steps/project/merge_requests.rb

@@ -213,7 +213,7 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
   end
 
   step 'I should see a comment like "Line is wrong" in the second file' do
-    within '.files [id^=diff]:nth-child(2) .note-text' do
+    within '.files [id^=diff]:nth-child(2) .note-body > .note-text' do
       page.should have_visible_content "Line is wrong"
     end
   end
@@ -225,7 +225,7 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
   end
 
   step 'I should see a comment like "Line is wrong here" in the second file' do
-    within '.files [id^=diff]:nth-child(2) .note-text' do
+    within '.files [id^=diff]:nth-child(2) .note-body > .note-text' do
       page.should have_visible_content "Line is wrong here"
     end
   end
@@ -238,7 +238,7 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
       click_button "Add Comment"
     end
 
-    within ".files [id^=diff]:nth-child(1) .note-text" do
+    within ".files [id^=diff]:nth-child(1) .note-body > .note-text" do
       page.should have_content "Line is correct"
     end
   end