Fix iterator reset and add reset ranges

The `git_iterator_reset` command has not been working in all cases
particularly when there is a start and end range.  This fixes it
and adds tests for it, and also extends it with the ability to
update the start/end range strings when an iterator is reset.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/iterator.h b/src/iterator.h
index 07cce5a5a..9fe684412 100644
--- a/src/iterator.h
+++ b/src/iterator.h
@@ -37,7 +37,7 @@ struct git_iterator {
 	int (*at_end)(git_iterator *);
 	int (*advance)(git_iterator *, const git_index_entry **);
 	int (*seek)(git_iterator *, const char *prefix);
-	int (*reset)(git_iterator *);
+	int (*reset)(git_iterator *, const char *start, const char *end);
 	void (*free)(git_iterator *);
 };
 
@@ -126,9 +126,10 @@ GIT_INLINE(int) git_iterator_seek(
 	return iter->seek(iter, prefix);
 }
 
-GIT_INLINE(int) git_iterator_reset(git_iterator *iter)
+GIT_INLINE(int) git_iterator_reset(
+	git_iterator *iter, const char *start, const char *end)
 {
-	return iter->reset(iter);
+	return iter->reset(iter, start, end);
 }
 
 GIT_INLINE(void) git_iterator_free(git_iterator *iter)