Inside reviews, comments are ordered with general comments first, then

screenshot comments (which usually don't exist), then file attachment comments,

and finally diff comments. Unfortunately, the comments listed in the issue

summary table and the review dialog didn't follow the same order. This change

fixes that up, so everything is consistent. As a bonus, when adding new

general comments within the review dialog, we'll now automatically scroll to

the newly-created comment editor.

Ran unit tests.
Ran js-tests.
Verified that comments appeared in the correct order for entries, the issue

  summary table, and the review dialog.
Verified that adding new general comments in the review dialog had the new

  comments created in the correct spot, and that the dialog scrolled to show

  the new editor.