This is following up on: http://bugs.gnu.org/22239
Could you please supply some specific test cases to illustrate the problem? I'm not seeing it, but this could be because I'm not using your locale, or am using machine-generated patterns. I am using master grep in the C locale on Ubuntu 15.10, with a pattern file generated like this:
seq -f 'pattern %g' 100000 >list.txt and running commands like this in the 'grep' source directory: src/grep -F -i -f list.txt $(git ls-files | grep -v gnulib) (or the same command without -i).
