Code review comment for lp://staging/~julian-edwards/maas/dup-boot-source-selections-bug-1360280

On Monday 10 Nov 2014 07:18:40 you wrote:
> ISTR Blake saying that we had to coalesce the entries for one OS/release
> rather than just dropping all-but-one, because the entries may all have
> different arches, subarches and labels — all of which are perfectly valid
> choices, but which need to be recorded in a single row, not several.
>
> So, if we don't want to have settings go away surprisingly, (1) is a good
> option.
>
> That said, could we add a persistent, user-clearable error* after doing (2)
> that says something like "MAAS's records of your boot source settings may
> have changed; check the Images tab to ensure that your boot image settings
> are correct."
>
> *Not sure we actually have the facility to do this; I was thinking of the
> persistent error stuff, but that all seems to be auto-cleared or not at
> all.

Actually I hadn't considered coalescing them - good point! I'll write some
runes to do that later.