Merge branch 'rs-diff_view' into 'master'
Always read diff_view setting from the cookie Prior, when the user had their view set to "parallel" and then visited a merge request's changes tab _without_ passing the `view` parameter via query string, the view would be parallel but the `Notes` class was always instantiated with the default value from `diff_view` ("inline"), resulting in broken markup when the form to add a line note was dynamically inserted. The cookie is set whenever the view is changed, so this value should always be up-to-date. Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14557 and https://gitlab.com/gitlab-org/gitlab-ce/issues/15285 See merge request !3732
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