Inconsistency with MR view `Fixed` layout
As discussed on slack, we have some issues with the Fixed
layout preference, specifically when viewing an MR, maybe elsewhere too.
When Fixed
is selected in the profile preferences, the MR should look like this...
However, some people, not all, get this... (which is how it should look for the Fluid
preference).
@alfredo1 has an inkling that this may be to do with a duplicate reference to the diff_view
cookie.