than the current one.
* insdel.c (modify_region): New argument BUFFER. Select that
buffer while we prepare for the modification, and switch back when
we're done.
* textprop.c (add_properties, remove_properties): Pass
the buffer being modified as the first argument to modify_region.
* editfns.c (Fsubst_char_in_region, Ftranslate_region): Pass the
current_buffer as the first argument to modify_region.
* casefiddle.c (casify_region): Same.