Use a new class to keep old behavior

app/assets/javascripts/diff.js.es6

@@ -76,7 +76,7 @@ require('./lib/utils/url_utility');
       const diffFile = diffTitle.closest('.diff-file');
       const nothingHereBlock = $('.nothing-here-block:visible', diffFile);
       if (nothingHereBlock.length) {
-        const clickTarget = $('.file-title, .click-to-expand', diffFile);
+        const clickTarget = $('.js-file-title, .click-to-expand', diffFile);
         diffFile.data('singleFileDiff').toggleDiff(clickTarget, () => {
           this.highlighSelectedLine();
           if (cb) cb();

app/assets/javascripts/single_file_diff.js

@@ -33,13 +33,13 @@
         this.$toggleIcon.addClass('fa-caret-down');
       }
-      $('.file-title, .click-to-expand', this.file).on('click', (function (e) {
+      $('.js-file-title, .click-to-expand', this.file).on('click', (function (e) {
         this.toggleDiff($(e.target));
       }).bind(this));
     }
     SingleFileDiff.prototype.toggleDiff = function($target, cb) {
-      if (!$target.hasClass('file-title') && !$target.hasClass('click-to-expand') && !$target.hasClass('diff-toggle-caret')) return;
+      if (!$target.hasClass('js-file-title') && !$target.hasClass('click-to-expand') && !$target.hasClass('diff-toggle-caret')) return;
       this.isOpen = !this.isOpen;
       if (!this.isOpen && !this.hasError) {
         this.content.hide();

app/views/admin/logs/show.html.haml

@@ -18,7 +18,7 @@
       .tab-pane{ class: (klass == Gitlab::GitLogger ? 'active' : ''),
           id: klass::file_name_noext }
         .file-holder#README
-          .file-title
+          .js-file-title.file-title
             %i.fa.fa-file
             = klass::file_name
             .pull-right

app/views/ci/lints/show.html.haml

@@ -11,7 +11,7 @@
       .form-group
         .col-sm-12
           .file-holder
-            .file-title.clearfix
+            .js-file-title.file-title.clearfix
               Content of .gitlab-ci.yml
             #ci-editor.ci-editor= @content
           = text_area_tag(:content, @content, class: 'hidden form-control span1', rows: 7, require: true)

app/views/discussions/_diff_with_notes.html.haml

@@ -2,7 +2,7 @@
 - blob = discussion.blob
 .diff-file.file-holder
-  .file-title
+  .js-file-title.file-title
     = render "projects/diffs/file_header", diff_file: diff_file, blob: blob, diff_commit: diff_file.content_commit, project: discussion.project, url: discussion_diff_path(discussion)
   .diff-content.code.js-syntax-highlight

app/views/help/ui.html.haml

@@ -528,7 +528,7 @@
   - blob = Snippet.new(content: "Wow\nSuch\nFile")
   .example
     .file-holder
-      .file-title
+      .js-file-title.file-title
         Awesome file
         .file-actions
           .btn-group

app/views/projects/blame/show.html.haml

@@ -7,7 +7,7 @@
   #blob-content-holder.tree-holder
     .file-holder
-      .file-title
+      .js-file-title.file-title
         = blob_icon @blob.mode, @blob.name
         %strong
           = @path

app/views/projects/blob/_blob.html.haml

@@ -24,7 +24,7 @@
 #blob-content-holder.blob-content-holder
   %article.file-holder
-    .file-title
+    .js-file-title.file-title
       = blob_icon blob.mode, blob.name
       %strong
         = blob.name

app/views/projects/blob/_editor.html.haml

 .file-holder.file.append-bottom-default
-  .file-title.clearfix
+  .js-file-title.file-title.clearfix
     .editor-ref
       = icon('code-fork')
       = ref

app/views/projects/diffs/_file.html.haml

 - environment = local_assigns.fetch(:environment, nil)
 .diff-file.file-holder{ id: file_hash, data: diff_file_html_data(project, diff_file.file_path, diff_commit.id) }
-  .file-title-flex-parent
+  .js-file-title.file-title-flex-parent
     = render "projects/diffs/file_header", diff_file: diff_file, blob: blob, diff_commit: diff_commit, project: project, url: "##{file_hash}"
     - unless diff_file.submodule?

app/views/projects/merge_requests/conflicts.html.haml

@@ -23,7 +23,7 @@
   .files-wrapper{ "v-if" => "!isLoading && !hasError" }
     .files
       .diff-file.file-holder.conflict{ "v-for" => "file in conflictsData.files" }
-        .file-title
+        .js-file-title.file-title
           %i.fa.fa-fw{ ":class" => "file.iconClass" }
           %strong {{file.filePath}}
           = render partial: 'projects/merge_requests/conflicts/file_actions'

app/views/projects/snippets/show.html.haml

@@ -4,7 +4,7 @@
 .project-snippets
   %article.file-holder.snippet-file-content
-    .file-title
+    .js-file-title.file-title
       = blob_icon 0, @snippet.file_name
       = @snippet.file_name
       .file-actions

app/views/projects/tree/_readme.html.haml

 %article.file-holder.readme-holder
-  .file-title
+  .js-file-title.file-title
     = blob_icon readme.mode, readme.name
     = link_to namespace_project_blob_path(@project.namespace, @project, tree_join(@ref, @path, readme.name)) do
       %strong

app/views/search/results/_blob.html.haml

 - file_name, blob = blob
 .blob-result
   .file-holder
-    .file-title
+    .js-file-title.file-title
       - ref = @search_results.repository_ref
       - blob_link = namespace_project_blob_path(@project.namespace, @project, tree_join(ref, file_name))
       = link_to blob_link do

app/views/search/results/_snippet_blob.html.haml

@@ -14,7 +14,7 @@
   - snippet_path = reliable_snippet_path(snippet)
   = link_to snippet_path do
     .file-holder
-      .file-title
+      .js-file-title.file-title
         %i.fa.fa-file
         %strong= snippet.file_name
       - if markup?(snippet.file_name)

app/views/search/results/_wiki_blob.html.haml

 - wiki_blob = parse_search_result(wiki_blob)
 .blob-result
   .file-holder
-    .file-title
+    .js-file-title.file-title
       = link_to namespace_project_wiki_path(@project.namespace, @project, wiki_blob.basename) do
         %i.fa.fa-file
         %strong

app/views/shared/snippets/_form.html.haml

@@ -18,7 +18,7 @@
         = f.label :file_name, "File", class: 'control-label'
         .col-sm-10
           .file-holder.snippet
-            .file-title
+            .js-file-title.file-title
               = f.text_field :file_name, placeholder: "Optionally name this file to add code highlighting, e.g. example.rb for Ruby.", class: 'form-control snippet-file-name'
             .file-content.code
               %pre#editor= @snippet.content

app/views/sherlock/file_samples/show.html.haml

@@ -26,7 +26,7 @@
       = @file_sample.events
 %article.file-holder
-  .file-title
+  .js-file-title.file-title
     %i.fa.fa-file-text-o.fa-fw
     %strong
       = @file_sample.file

app/views/snippets/show.html.haml

@@ -3,7 +3,7 @@
 = render 'shared/snippets/header'
 %article.file-holder.snippet-file-content
-  .file-title
+  .js-file-title.file-title
     = blob_icon 0, @snippet.file_name
     = @snippet.file_name
     .file-actions

spec/features/expand_collapse_diffs_spec.rb

@@ -72,8 +72,8 @@ feature 'Expand and collapse diffs', js: true, feature: true do
     it 'collapses large diffs for renamed files by default' do
       expect(large_diff_renamed).not_to have_selector('.code')
       expect(large_diff_renamed).to have_selector('.nothing-here-block')
-      expect(large_diff_renamed).to have_selector('.file-title .deletion')
-      expect(large_diff_renamed).to have_selector('.file-title .addition')
+      expect(large_diff_renamed).to have_selector('.js-file-title .deletion')
+      expect(large_diff_renamed).to have_selector('.js-file-title .addition')
     end
     it 'shows non-renderable diffs as such immediately, regardless of their size' do
@@ -115,9 +115,9 @@ feature 'Expand and collapse diffs', js: true, feature: true do
     context 'expanding a large diff' do
       before do
         # Wait for diffs
-        find('.file-title', match: :first)
+        find('.js-file-title', match: :first)
         # Click `large_diff.md` title
-        all('.file-title')[1].click
+        all('.js-file-title')[1].click
         wait_for_ajax
       end
@@ -159,9 +159,9 @@ feature 'Expand and collapse diffs', js: true, feature: true do
           context 'expanding the diff' do
             before do
               # Wait for diffs
-              find('.file-title', match: :first)
+              find('.js-file-title', match: :first)
               # Click `large_diff.md` title
-              all('.file-title')[1].click
+              all('.js-file-title')[1].click
               wait_for_ajax
             end
@@ -181,9 +181,9 @@ feature 'Expand and collapse diffs', js: true, feature: true do
     context 'collapsing an expanded diff' do
       before do
         # Wait for diffs
-        find('.file-title', match: :first)
+        find('.js-file-title', match: :first)
         # Click `small_diff.md` title
-        all('.file-title')[3].click
+        all('.js-file-title')[3].click
       end
       it 'hides the diff content' do
@@ -194,9 +194,9 @@ feature 'Expand and collapse diffs', js: true, feature: true do
       context 're-expanding the same diff' do
         before do
           # Wait for diffs
-          find('.file-title', match: :first)
+          find('.js-file-title', match: :first)
           # Click `small_diff.md` title
-          all('.file-title')[3].click
+          all('.js-file-title')[3].click
         end
         it 'shows the diff content' do
@@ -290,9 +290,9 @@ feature 'Expand and collapse diffs', js: true, feature: true do
     context 'collapsing an expanded diff' do
       before do
         # Wait for diffs
-        find('.file-title', match: :first)
+        find('.js-file-title', match: :first)
         # Click `small_diff.md` title
-        all('.file-title')[3].click
+        all('.js-file-title')[3].click
       end
       it 'hides the diff content' do
@@ -303,9 +303,9 @@ feature 'Expand and collapse diffs', js: true, feature: true do
       context 're-expanding the same diff' do
         before do
           # Wait for diffs
-          find('.file-title', match: :first)
+          find('.js-file-title', match: :first)
           # Click `small_diff.md` title
-          all('.file-title')[3].click
+          all('.js-file-title')[3].click
         end
         it 'shows the diff content' do