`collections_for_image` answers this for one photograph and has no
counts, which is enough to badge a cell and not enough to offer a
removal: with forty selected and three of them in "Iceland", a sheet
that says only "Iceland" invites the user to take all forty out of a
collection thirty-seven were never in. `membership_of` returns the
count alongside the name so the row can say "3 of 40".
Chunked over the image list rather than one `IN (...)`, because the
list is a selection and a select-all makes it as large as the library —
past SQLite's bound-parameter cap on exactly the gesture most likely to
produce it. Counts are summed across chunks, so the answer is the one
the unchunked query would have given.
Smart collections are excluded by construction: they have no member
rows, so there is nothing a removal could do.
dtourolle
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