Merge branch...

Merge branch '24949-view-2-up-swipe-onion-skin-controls-for-merge-request-diff-containing-an-image' into 'master'

Add image controls to MR diffs

## What does this MR do?

Instantiates `ImageFile` in `Diff` which is instantiated in `MergeRequestTabs`.

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

## Why was this MR needed?

## Screenshots (if relevant)

![Screen_Shot_2016-12-04_at_11.11.21](/uploads/738c68ad3fa682c1c132421abce7165e/Screen_Shot_2016-12-04_at_11.11.21.png)

## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) 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 it does - 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 #24949

See merge request !7919

app/assets/javascripts/commit/file.js

@@ -3,7 +3,7 @@
   this.CommitFile = (function() {
     function CommitFile(file) {
       if ($('.image', file).length) {
-        new ImageFile(file);
+        new gl.ImageFile(file);
       }
     }
 

app/assets/javascripts/commit/image_file.js

 /* eslint-disable func-names, space-before-function-paren, wrap-iife, no-var, no-use-before-define, prefer-arrow-callback, no-else-return, consistent-return, prefer-template, quotes, one-var, one-var-declaration-per-line, no-unused-vars, no-return-assign, comma-dangle, quote-props, no-unused-expressions, no-sequences, object-shorthand, padded-blocks, max-len */
 (function() {
-  this.ImageFile = (function() {
+  gl.ImageFile = (function() {
     var prepareFrames;
 
     // Width where images must fits in, for 2-up this gets divided by 2

app/assets/javascripts/diff.js.es6

@@ -5,8 +5,11 @@
 
   class Diff {
     constructor() {
-      $('.files .diff-file').singleFileDiff();
-      $('.files .diff-file').filesCommentButton();
+      const $diffFile = $('.files .diff-file');
+      $diffFile.singleFileDiff();
+      $diffFile.filesCommentButton();
+
+      $diffFile.each((index, file) => new gl.ImageFile(file));
 
       if (this.diffViewType() === 'parallel') {
         $('.content-wrapper .container-fluid').removeClass('container-limited');

changelogs/unreleased/24949-view-2-up-swipe-onion-skin-controls-for-merge-request-diff-containing-an-image.yml

+---
+title: Add image controls to MR diffs
+merge_request: 7919
+author: