sed -i with more than one file treated them as one continuous stream:
line numbers continued across files, $ matched only the last line of
the last file, and N could join lines from different files. GNU sed
documents -i as implying -s, so enable separate-file processing for
--in-place as well as --separate.
There was a second bug when automatic output was suppressed. At the end
of a file, process_file cleared a pending N action only when
!context.quiet. With -n, the action carried into the next file and
joined with its first line. Clear the action in either mode, but write
the pattern space only when automatic output is enabled.
The same bug can be reproduced without -i. With f1 containing a1, a2,
a3 and f2 containing b1, b2, b3:
sed -n -s -e 'N;s/\n/+/;p' f1 f2
Before this change it prints a1+a2, a3+b1, b2+b3. GNU prints a1+a2,
b1+b2.
Add coverage for line numbers, $, ranges, N across file boundaries,
hold space, Q, backup suffixes, and -n.
Sichen
ab2f0a82d8