git-add: no need for -f when resolving a conflict in already tracked path

When a path F that matches ignore pattern has a conflict, "git add F" insisted the -f option be given, which did not make sense. It would have required -f when the path was originally added, but when resolving a conflict, it already is tracked. So this should work (and does): $ echo file >.gitignore $ echo content >file $ git add -f file ;# need -f because we are adding new path $ echo more content >>file $ git add file ;# don't need -f; it is not actually an "other" file This is handled under the hood by the COLLECT_IGNORED option to read_directory. When that code finds an ignored file, it checks the index to make sure it is not actually a tracked file. However, the test it uses does not take into account unmerged entries, and considers them to still be ignored. "git ls-files" uses a more elaborate test and gets the right answer and the same test should be used here. Signed-off-by: Junio C Hamano <gitster@pobox.com>