Merge branch 'issue_4271' into 'master'
Add button to toggle whitespace changes Closes #4271 **Merge Request** <img src="/uploads/ea857269faed38a25b63b768d7f3a85b/Screen_Shot_2016-03-23_at_11.32.41_AM.png" width="1157" /> **Diff view** <img src="/uploads/bc2ac3e4855584f9214c8f3ddf325b06/Screen_Shot_2016-03-23_at_11.32.53_AM.png" width="1211" /> See merge request !3367
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![doc/workflow/merge_requests/commit_compare.png](https://lab.node.vifib.com/jerome/gitlab-ce/-/raw/dfe0ec8f72a13da2b45c52761a846204c2e66326/doc/workflow/merge_requests/commit_compare.png)
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