dir.c: don't exclude whole dir prematurely if neg pattern may match
If there is a pattern "!foo/bar", this patch makes it not exclude "foo" right away. This gives us a chance to examine "foo" and re-include "foo/bar". In order for it to detect that the directory under examination should not be excluded right away, in other words it is a parent directory of a negative pattern, the "directory path" of the negative pattern must be literal. Patterns like "!f?o/bar" can't stop "foo" from being excluded. Basename matching (i.e. "no slashes in the pattern") or must-be-dir matching (i.e. "trailing slash in the pattern") does not work well with this. For example, if we descend in "foo" and are examining "foo/abc", current code for "foo/" pattern will check if path "foo/abc", not "foo", is a directory. The same problem with basename matching. These may need big code reorg to make it work. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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