Cannot hide whitespace changes when an anchor link is present in the URL

1. Load a merge request with an anchor link to a discussion, such as from an email notification.
   • We'll use https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22050/diffs#note_106554124? as an example
2. Click Hide whitespace changes
   • Note the URL is now https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22050/diffs#note_106554124?w=1, which is invalid. The query string needs to come before the anchor.