Don't just exit when encountering the 'q' command if we edit file
inplace, and give mf_fgets() a chance to actually handle the
inplace case.
Also add a regression test.
Submitted by: Yuri Pankov <yuripv@yuripv.net>
Approved by: re (kib)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D16798
The S_ISREG check was restored, such that the code will again fail with
in-place replacements on symlinks
MFC after: 12 days
X-MFC with: r313277
Sponsored by: Dell EMC Isilon