sparse-index: sparse index is disallowed when split index is active

In 6e77352 (sparse-index: convert from full to sparse, 2021-03-30),
we introduced initial support for a sparse index, and were careful to
avoid converting to a sparse index in the presence of a split index.

However, when we _just_ read a freshly-initialized index, it might not
contain a split index even if _writing_ it will add one by virtue of
being asked for via the `GIT_TEST_SPLIT_INDEX` variable.

We did not notice any problems with checking _only_ for `split_index`
(and not `GIT_TEST_SPLIT_INDEX`) right until both
`vd/sparse-sparsity-fix-on-read` _and_ `vd/sparse-reset` were merged.

Those two topics' interplay triggers a bug in conjunction with running
t1091.15 when `GIT_TEST_SPLIT_INDEX=true` in the following way:
`vd/sparse-sparsity-fix-on-read` ensures that the index is made sparse
right after reading, and `vd/sparse-reset` ensures that the index is
made non-sparse again unless running in the `--soft` mode. Since the
split index feature is incompatible with the sparse index feature, we
see a symptom like this:

	fatal: position for replacement 4 exceeds base index size 4

Let's fix this by avoiding the conversion to a sparse index when
`GIT_TEST_SPLIT_INDEX=true`.

Signed-off-by: Johannes Schindelin <[email protected]>
Reviewed-by: Elijah Newren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: dscho

sparse-index.c

@@ -136,7 +136,7 @@ static int is_sparse_index_allowed(struct index_state *istate, int flags)
 		/*
 		 * The sparse index is not (yet) integrated with a split index.
 		 */
-		if (istate->split_index)
+		if (istate->split_index || git_env_bool("GIT_TEST_SPLIT_INDEX", 0))
 			return 0;
 		/*
 		 * The GIT_TEST_SPARSE_INDEX environment variable triggers the