Where exactly would you want the predicate to be specified?
In the partial-completion-mode code? (Like in the attached patch?)
Or in read-file-name?
It could be done in read-file-name. Perhaps read-file-name,
when you specify "an existing file name", should always accept
names of symlinks to nonexistent files.
Another idea is to define another possible value for the MUSTMATCH
argument to read-file-name, which would stand for "existing file name
or symlink to nowhere". Then this could be specified where
appropriate.
If you look in one of my messages in this thread:
PC-do-completion calls test-completions that calls
read-file-name-internal which returns Qnil because of this code:
A question occurs to me: is it really right for partial completion
to call test-completion here? What operation did the user do?
Without partial completion mode, using the standard completion code,
would that operation call test-completion? If not, then perhaps it
is wrong for partial completion mode to call it. Or maybe it should
call it, but handle the return value of nil in a way more
consistent with ordinary completion.
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