PR comments on initially-hidden lines are hidden

If you comment on an initially-hidden line, it is hidden from view on subsequent page loads; even if you arrive via the deep link. So, basically, you're wasting your time.

Also annoying is you cna't reveal the whole file in one click, in the initial case I have to click expand three times in a row to get to the comment.

Steps to reproduce:

1. open a Pull Request with a long file
2. expand an area of the file that wasn't edited
3. comment on a line in the initally-hidden area
4. copy the deep link
5. open a new window to that deep link - comment is not revealed (screenshot 1)
6. scroll down the relevant file - comment still not revealed (screenshot 2)
7. expand the file until you find the comment (screenshot 3)

Page where I identified the problem:
https://bitbucket.org/atlassian/aui-archive/pull-request/150/aui-974-first-cut-of-a-soy-servlet/diff

The deep link is https://bitbucket.org/atlassian/aui-archive/pull-request/150/aui-974-first-cut-of-a-soy-servlet/diff#comment-35092

The comment is in auiplugin-tests/src/main/resources/atlassian-plugin.xml