pointed out by naddy@ ok millert@

Fixes regression introduced by commit 41f061b2f459318f3738f59d7676efccc4beb344 where tracked files inside an ignored directory were reported as missing.

This is important in cases like 'got diff file.txt file.txt' which should only show the diff for file.txt once. suggested by kn@

Found by our cherrypick regression tests.

Annoying bug which we inherited from OpenRCS which inherited it from OpenBSD's diff3 program. ok tracey millert

Cache commit timestamps in struct got_reference in case we are sorting references by commit timestamp. This avoids opening and closing commits every time we compare two references with each other. ok thomas.adam

Need for filtering by path sugggested by kn@ ok naddy@

ok millert@

Potentially this function could return objects of a type that was not requested. Problem found by code inspection. This change does not affect any of our existing tests.

Based on a patch by Omar Polo

positive feedback from Omar and kn ok kn

OK stsp