[Q] respect CODESYS in `insert-file-contents-internal'.

[Stephen J. Turnbull]

Nix writes:

 > (The underlying problem in 21.4 was that insert_file_contents didn't
 > actually *change* the coding system in use to that specified by the
 > CODESYS, but *did* call the file-name-handlers,

OK.  I have doubt that's been fixed in 21.4 yet, but I'm pretty sure I
can find the appropriate place, and probably your old patch in the
archives.  I assume your recommendation is to apply a similar patch to
21.4.

I notice in looking at insert-file-contents-internal in 21.4 that if a
handler is called, then the "goto handled" jumps past all of the
unbind_to (speccount, Qnil) calls.  That would seem to be a horrible
error, isn't that so?  Am I missing something?