Merge branch '21369-make-it-clearer-that-diffs-can-be-collapsed' into 'master'

Updated diff toggle targets and added icon

## What does this MR do?

Adds the new diff toggle icon and alters the toggle targets.

User can now click on the file header bar _(where no other elements are above it, apart from the icon)_ and the `Click to expand` link to expand the diff and no where else.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

![Screen_Shot_2016-09-02_at_15.35.15](/uploads/c1cb8c0547328153250294d6c95dd96a/Screen_Shot_2016-09-02_at_15.35.15.png)

####  Gif

![2016-09-02_15.34.31](/uploads/abaefaeba9ce8ef129522dae34574c57/2016-09-02_15.34.31.gif)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #21369 

Closes #20326

See merge request !6183

1 files changed, 33 insertions, 7 deletions

diff --git a/spec/features/expand_collapse_diffs_spec.rb b/spec/features/expand_collapse_diffs_spec.rb
index 8863554ee91..6c938bdead8 100644
--- a/spec/features/expand_collapse_diffs_spec.rb
+++ b/spec/features/expand_collapse_diffs_spec.rb
@@ -68,7 +68,7 @@ feature 'Expand and collapse diffs', js: true, feature: true do
 
     context 'expanding a diff for a renamed file' do
       before do
-        large_diff_renamed.find('.nothing-here-block').click
+        large_diff_renamed.find('.click-to-expand').click
         wait_for_ajax
       end
 
@@ -87,7 +87,10 @@ feature 'Expand and collapse diffs', js: true, feature: true do
 
     context 'expanding a large diff' do
       before do
-        click_link('large_diff.md')
+        # Wait for diffs
+        find('.file-title', match: :first)
+        # Click `large_diff.md` title
+        all('.file-title')[1].click
         wait_for_ajax
       end
 
@@ -128,7 +131,10 @@ feature 'Expand and collapse diffs', js: true, feature: true do
 
           context 'expanding the diff' do
             before do
-              click_link('large_diff.md')
+              # Wait for diffs
+              find('.file-title', match: :first)
+              # Click `large_diff.md` title
+              all('.file-title')[1].click
               wait_for_ajax
             end
 
@@ -146,7 +152,12 @@ feature 'Expand and collapse diffs', js: true, feature: true do
     end
 
     context 'collapsing an expanded diff' do
-      before { click_link('small_diff.md') }
+      before do
+        # Wait for diffs
+        find('.file-title', match: :first)
+        # Click `small_diff.md` title
+        all('.file-title')[3].click
+      end
 
       it 'hides the diff content' do
         expect(small_diff).not_to have_selector('.code')
@@ -154,7 +165,12 @@ feature 'Expand and collapse diffs', js: true, feature: true do
       end
 
       context 're-expanding the same diff' do
-        before { click_link('small_diff.md') }
+        before do
+          # Wait for diffs
+          find('.file-title', match: :first)
+          # Click `small_diff.md` title
+          all('.file-title')[3].click
+        end
 
         it 'shows the diff content' do
           expect(small_diff).to have_selector('.code')
@@ -231,7 +247,12 @@ feature 'Expand and collapse diffs', js: true, feature: true do
     end
 
     context 'collapsing an expanded diff' do
-      before { click_link('small_diff.md') }
+      before do
+        # Wait for diffs
+        find('.file-title', match: :first)
+        # Click `small_diff.md` title
+        all('.file-title')[3].click
+      end
 
       it 'hides the diff content' do
         expect(small_diff).not_to have_selector('.code')
@@ -239,7 +260,12 @@ feature 'Expand and collapse diffs', js: true, feature: true do
       end
 
       context 're-expanding the same diff' do
-        before { click_link('small_diff.md') }
+        before do
+          # Wait for diffs
+          find('.file-title', match: :first)
+          # Click `small_diff.md` title
+          all('.file-title')[3].click
+        end
 
         it 'shows the diff content' do
           expect(small_diff).to have_selector('.code')