histedit: resolve revs before evaluating %ld revset
We want to stop relying on basectx.__int__. That means we can't
use the %ld revset operator with an iterable of contexts. So
we expand an iterable of contexts into a list of revs before calling
into the revset.
Perhaps it would be worthwhile to add a revset format operator
that recognizes context instances so we can just pass contexts
as revset arguments?
Differential Revision: https://phab.mercurial-scm.org/D2431
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