synthrepo: create filectx instance in 'filectxfn' callback...
synthrepo: create filectx instance in 'filectxfn' callback
I would like to pass the memctx to the memfilectx constructor, but
it's not available where we currently create the memfilectx. It is
available in the 'filectxfn' callback, so let's create the memfilectx
there instead. A later patch will start actually passing the memctx.
Differential Revision:
https://phab.mercurial-scm.org/D1669
