Reviewing a Maintenance Request which contains more than one source, is not
reviewable using either the webui or osc.

Example:
https://build.opensuse.org/request/show/294120

Only the first tab has any valuable content to review; the other tabs at best
list files that change, but no actuall changes.

The situation isn't any better using osc:
> osc rq show -i 294120
d(i)ff/(a)ccept/(d)ecline/(r)evoke/(b)uildstatus/c(l)one/(s)kip/(c)ancel > i
Server returned an error: HTTP Error 404: Not Found
Timeout while diffing
/source/openSUSE:Maintenance:3673/MozillaFirefox.openSUSE_13.1_Update?cmd=diff&expand=1&filelimit=10000&opackage=MozillaFirefox&oproject=openSUSE%3A13.1%3AUpdate