bug#39678: 'grep --ignore-case --color' does not always color the matches

[Tomasz Dziendzielski]

I found that for optimization purposes common cases in re_string_peek_byte
are missed if pstr->mbs_allocated is true, thus skipping them also for case
insensitive.

My solution would be to return re_string_peek_byte also if pstr->icase is
true. mbs_allocated is changed also depending on icase but I don't think we
want to change it globally, so I think my patch should be fine and not
affect optimization.

Please check the attachment. If the patch is fine should I also send this
to gnulib mailing list to have it submitted or is this one enough?

Best regards,
Tomasz Dziendzielski

0001-regex-Handle-common-easiest-cases-if-case-insensitiv.patch
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