diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index ddbc1de43f..4fb0c4fbb0 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -730,20 +730,32 @@ specification contained in <path>.
 +
 The form '--filter=tree:<depth>' omits all blobs and trees whose depth
 from the root tree is >= <depth> (minimum depth if an object is located
 at multiple depths in the commits traversed). <depth>=0 will not include
 any trees or blobs unless included explicitly in the command-line (or
 standard input when --stdin is used). <depth>=1 will include only the
 tree and blobs which are referenced directly by a commit reachable from
 <commit> or an explicitly-given object. <depth>=2 is like <depth>=1
 while also including trees and blobs one more level removed from an
 explicitly-given commit or tree.
++
+The form '--filter=combine:<filter1>+<filter2>+...<filterN>' combines
+several filters. Only objects which are accepted by every filter are
+included. Filters are joined by '{plus}' and individual filters are %-encoded
+(i.e. URL-encoded). Besides the '{plus}' and '%' characters, the following
+characters are reserved and also must be encoded:
+`~!@#$^&*()[]{}\;",<>?`+&#39;&#96;+ as well as all characters with ASCII code
+&lt;= `0x20`, which includes space and newline.
++
+Other arbitrary characters can also be encoded. For instance,
+'combine:tree:3+blob:none' and 'combine:tree%3A2+blob%3Anone' are
+equivalent.
 
 --no-filter::
 	Turn off any previous `--filter=` argument.
 
 --filter-print-omitted::
 	Only useful with `--filter=`; prints a list of the objects omitted
 	by the filter.  Object IDs are prefixed with a ``~'' character.
 
 --missing=<missing-action>::
 	A debug option to help with future "partial clone" development.
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 3eefbabdb1..0fd0a10d0c 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1529,21 +1529,21 @@ _git_difftool ()
 __git_fetch_recurse_submodules="yes on-demand no"
 
 _git_fetch ()
 {
 	case "$cur" in
 	--recurse-submodules=*)
 		__gitcomp "$__git_fetch_recurse_submodules" "" "${cur##--recurse-submodules=}"
 		return
 		;;
 	--filter=*)
-		__gitcomp "blob:none blob:limit= sparse:oid= sparse:path=" "" "${cur##--filter=}"
+		__gitcomp "blob:none blob:limit= sparse:oid= sparse:path= combine: tree:" "" "${cur##--filter=}"
 		return
 		;;
 	--*)
 		__gitcomp_builtin fetch
 		return
 		;;
 	esac
 	__git_complete_remote_or_refspec
 }
 
diff --git a/list-objects-filter-options.c b/list-objects-filter-options.c
index e46ea467bc..d7a1516188 100644
--- a/list-objects-filter-options.c
+++ b/list-objects-filter-options.c
@@ -1,19 +1,24 @@
 #include "cache.h"
 #include "commit.h"
 #include "config.h"
 #include "revision.h"
 #include "argv-array.h"
 #include "list-objects.h"
 #include "list-objects-filter.h"
 #include "list-objects-filter-options.h"
 
+static int parse_combine_filter(
+	struct list_objects_filter_options *filter_options,
+	const char *arg,
+	struct strbuf *errbuf);
+
 /*
  * Parse value of the argument to the "filter" keyword.
  * On the command line this looks like:
  *       --filter=<arg>
  * and in the pack protocol as:
  *       "filter" SP <arg>
  *
  * The filter keyword will be used by many commands.
  * See Documentation/rev-list-options.txt for allowed values for <arg>.
  *
@@ -31,22 +36,20 @@ static int gently_parse_list_objects_filter(
 
 	if (filter_options->choice) {
 		if (errbuf) {
 			strbuf_addstr(
 				errbuf,
 				_("multiple filter-specs cannot be combined"));
 		}
 		return 1;
 	}
 
-	filter_options->filter_spec = strdup(arg);
-
 	if (!strcmp(arg, "blob:none")) {
 		filter_options->choice = LOFC_BLOB_NONE;
 		return 0;
 
 	} else if (skip_prefix(arg, "blob:limit=", &v0)) {
 		if (git_parse_ulong(v0, &filter_options->blob_limit_value)) {
 			filter_options->choice = LOFC_BLOB_LIMIT;
 			return 0;
 		}
 
@@ -74,37 +77,183 @@ static int gently_parse_list_objects_filter(
 		if (!get_oid_with_context(the_repository, v0, GET_OID_BLOB,
 					  &sparse_oid, &oc))
 			filter_options->sparse_oid_value = oiddup(&sparse_oid);
 		filter_options->choice = LOFC_SPARSE_OID;
 		return 0;
 
 	} else if (skip_prefix(arg, "sparse:path=", &v0)) {
 		filter_options->choice = LOFC_SPARSE_PATH;
 		filter_options->sparse_path_value = strdup(v0);
 		return 0;
+
+	} else if (skip_prefix(arg, "combine:", &v0)) {
+		int sub_parse_res = parse_combine_filter(
+			filter_options, v0, errbuf);
+		if (sub_parse_res)
+			return sub_parse_res;
+		return 0;
+
 	}
 	/*
 	 * Please update _git_fetch() in git-completion.bash when you
 	 * add new filters
 	 */
 
 	if (errbuf)
 		strbuf_addf(errbuf, _("invalid filter-spec '%s'"), arg);
 
 	memset(filter_options, 0, sizeof(*filter_options));
 	return 1;
 }
 
+static int digit_value(int c, struct strbuf *errbuf) {
+	if (c >= '0' && c <= '9')
+		return c - '0';
+	if (c >= 'a' && c <= 'f')
+		return c - 'a' + 10;
+	if (c >= 'A' && c <= 'F')
+		return c - 'A' + 10;
+
+	if (!errbuf)
+		return -1;
+
+	strbuf_addf(errbuf, _("error in filter-spec - "));
+	if (c)
+		strbuf_addf(
+			errbuf,
+			_("expect two hex digits after %%, but got: '%c'"),
+			c);
+	else
+		strbuf_addf(
+			errbuf,
+			_("not enough hex digits after %%; expected two"));
+
+	return -1;
+}
+
+static int url_decode(struct strbuf *s, struct strbuf *errbuf) {
+	char *dest = s->buf;
+	char *src = s->buf;
+	size_t new_len;
+
+	while (*src) {
+		int digit_value_0, digit_value_1;
+
+		if (src[0] != '%') {
+			*dest++ = *src++;
+			continue;
+		}
+		src++;
+
+		digit_value_0 = digit_value(*src++, errbuf);
+		if (digit_value_0 < 0)
+			return 1;
+		digit_value_1 = digit_value(*src++, errbuf);
+		if (digit_value_1 < 0)
+			return 1;
+		*dest++ = digit_value_0 * 16 + digit_value_1;
+	}
+	new_len = dest - s->buf;
+	strbuf_remove(s, new_len, s->len - new_len);
+
+	return 0;
+}
+
+static const char *RESERVED_NON_WS = "~`!@#$^&*()[]{}\\;'\",<>?";
+
+static int has_reserved_character(
+	struct strbuf *sub_spec, struct strbuf *errbuf)
+{
+	const char *c = sub_spec->buf;
+	while (*c) {
+		if (*c <= ' ' || strchr(RESERVED_NON_WS, *c))
+			goto found_reserved;
+		c++;
+	}
+
+	return 0;
+
+found_reserved:
+	if (errbuf)
+		strbuf_addf(errbuf,
+			    "must escape char in sub-filter-spec: '%c'",
+			    *c);
+	return 1;
+}
+
+static int parse_combine_filter(
+	struct list_objects_filter_options *filter_options,
+	const char *arg,
+	struct strbuf *errbuf)
+{
+	struct strbuf **sub_specs = strbuf_split_str(arg, '+', 2);
+	int result;
+
+	if (!sub_specs[0]) {
+		if (errbuf)
+			strbuf_addf(errbuf,
+				    _("expected something after combine:"));
+		result = 1;
+		goto cleanup;
+	}
+
+	result = has_reserved_character(sub_specs[0], errbuf);
+	if (result)
+		goto cleanup;
+
+	/*
+	 * Only decode the first sub-filter, since the rest will be decoded on
+	 * the recursive call.
+	 */
+	result = url_decode(sub_specs[0], errbuf);
+	if (result)
+		goto cleanup;
+
+	if (!sub_specs[1]) {
+		/*
+		 * There is only one sub-filter, so we don't need the
+		 * combine: - just parse it as a non-composite filter.
+		 */
+		result = gently_parse_list_objects_filter(
+			filter_options, sub_specs[0]->buf, errbuf);
+		goto cleanup;
+	}
+
+	/* Remove trailing "+" so we can parse it. */
+	assert(sub_specs[0]->buf[sub_specs[0]->len - 1] == '+');
+	strbuf_remove(sub_specs[0], sub_specs[0]->len - 1, 1);
+
+	filter_options->choice = LOFC_COMBINE;
+	filter_options->lhs = xcalloc(1, sizeof(*filter_options->lhs));
+	filter_options->rhs = xcalloc(1, sizeof(*filter_options->rhs));
+
+	result = gently_parse_list_objects_filter(filter_options->lhs,
+						  sub_specs[0]->buf,
+						  errbuf) ||
+		parse_combine_filter(filter_options->rhs,
+				      sub_specs[1]->buf,
+				      errbuf);
+
+cleanup:
+	strbuf_list_free(sub_specs);
+	if (result) {
+		list_objects_filter_release(filter_options);
+		memset(filter_options, 0, sizeof(*filter_options));
+	}
+	return result;
+}
+
 int parse_list_objects_filter(struct list_objects_filter_options *filter_options,
 			      const char *arg)
 {
 	struct strbuf buf = STRBUF_INIT;
+	filter_options->filter_spec = strdup(arg);
 	if (gently_parse_list_objects_filter(filter_options, arg, &buf))
 		die("%s", buf.buf);
 	return 0;
 }
 
 int opt_parse_list_objects_filter(const struct option *opt,
 				  const char *arg, int unset)
 {
 	struct list_objects_filter_options *filter_options = opt->value;
 
@@ -127,23 +276,29 @@ void expand_list_objects_filter_spec(
 	else if (filter->choice == LOFC_TREE_DEPTH)
 		strbuf_addf(expanded_spec, "tree:%lu",
 			    filter->tree_exclude_depth);
 	else
 		strbuf_addstr(expanded_spec, filter->filter_spec);
 }
 
 void list_objects_filter_release(
 	struct list_objects_filter_options *filter_options)
 {
+	if (!filter_options)
+		return;
 	free(filter_options->filter_spec);
 	free(filter_options->sparse_oid_value);
 	free(filter_options->sparse_path_value);
+	list_objects_filter_release(filter_options->lhs);
+	free(filter_options->lhs);
+	list_objects_filter_release(filter_options->rhs);
+	free(filter_options->rhs);
 	memset(filter_options, 0, sizeof(*filter_options));
 }
 
 void partial_clone_register(
 	const char *remote,
 	const struct list_objects_filter_options *filter_options)
 {
 	/*
 	 * Record the name of the partial clone remote in the
 	 * config and in the global variable -- the latter is
@@ -171,14 +326,16 @@ void partial_clone_register(
 }
 
 void partial_clone_get_default_filter_spec(
 	struct list_objects_filter_options *filter_options)
 {
 	/*
 	 * Parse default value, but silently ignore it if it is invalid.
 	 */
 	if (!core_partial_clone_filter_default)
 		return;
+
+	filter_options->filter_spec = strdup(core_partial_clone_filter_default);
 	gently_parse_list_objects_filter(filter_options,
 					 core_partial_clone_filter_default,
 					 NULL);
 }
diff --git a/list-objects-filter-options.h b/list-objects-filter-options.h
index e3adc78ebf..6c0f0ecd08 100644
--- a/list-objects-filter-options.h
+++ b/list-objects-filter-options.h
@@ -7,20 +7,21 @@
 /*
  * The list of defined filters for list-objects.
  */
 enum list_objects_filter_choice {
 	LOFC_DISABLED = 0,
 	LOFC_BLOB_NONE,
 	LOFC_BLOB_LIMIT,
 	LOFC_TREE_DEPTH,
 	LOFC_SPARSE_OID,
 	LOFC_SPARSE_PATH,
+	LOFC_COMBINE,
 	LOFC__COUNT /* must be last */
 };
 
 struct list_objects_filter_options {
 	/*
 	 * 'filter_spec' is the raw argument value given on the command line
 	 * or protocol request.  (The part after the "--keyword=".)  For
 	 * commands that launch filtering sub-processes, or for communication
 	 * over the network, don't use this value; use the result of
 	 * expand_list_objects_filter_spec() instead.
@@ -32,28 +33,35 @@ struct list_objects_filter_options {
 	 * the filtering algorithm to use.
 	 */
 	enum list_objects_filter_choice choice;
 
 	/*
 	 * Choice is LOFC_DISABLED because "--no-filter" was requested.
 	 */
 	unsigned int no_filter : 1;
 
 	/*
-	 * Parsed values (fields) from within the filter-spec.  These are
-	 * choice-specific; not all values will be defined for any given
-	 * choice.
+	 * BEGIN choice-specific parsed values from within the filter-spec. Only
+	 * some values will be defined for any given choice.
 	 */
+
 	struct object_id *sparse_oid_value;
 	char *sparse_path_value;
 	unsigned long blob_limit_value;
 	unsigned long tree_exclude_depth;
+
+	/* LOFC_COMBINE values */
+	struct list_objects_filter_options *lhs, *rhs;
+
+	/*
+	 * END choice-specific parsed values.
+	 */
 };
 
 /* Normalized command line arguments */
 #define CL_ARG__FILTER "filter"
 
 int parse_list_objects_filter(
 	struct list_objects_filter_options *filter_options,
 	const char *arg);
 
 int opt_parse_list_objects_filter(const struct option *opt,
diff --git a/list-objects-filter.c b/list-objects-filter.c
index 8e8616b9b8..b97277a46f 100644
--- a/list-objects-filter.c
+++ b/list-objects-filter.c
@@ -453,34 +453,148 @@ static void filter_sparse_path__init(
 
 	ALLOC_GROW(d->array_frame, d->nr + 1, d->alloc);
 	d->array_frame[d->nr].defval = 0; /* default to include */
 	d->array_frame[d->nr].child_prov_omit = 0;
 
 	ctx->filter_fn = filter_sparse;
 	ctx->free_fn = filter_sparse_free;
 	ctx->data = d;
 }
 
+struct filter_combine_data {
+	/* sub[0] corresponds to lhs, sub[1] to rhs. */
+	struct {
+		struct filter_context ctx;
+		struct oidset seen;
+		struct object_id skip_tree;
+		unsigned is_skipping_tree : 1;
+	} sub[2];
+
+	struct oidset rhs_omits;
+};
+
+static void add_all(struct oidset *dest, struct oidset *src) {
+	struct oidset_iter iter;
+	struct object_id *src_oid;
+
+	oidset_iter_init(src, &iter);
+	while ((src_oid = oidset_iter_next(&iter)) != NULL)
+		oidset_insert(dest, src_oid);
+}
+
+static void filter_combine_free(void *filter_data)
+{
+	struct filter_combine_data *d = filter_data;
+	int i;
+
+	/* Anything omitted by rhs should be added to the overall omits set. */
+	if (d->sub[0].ctx.omits)
+		add_all(d->sub[0].ctx.omits, d->sub[1].ctx.omits);
+
+	for (i = 0; i < 2; i++) {
+		list_objects_filter__release(&d->sub[i].ctx);
+		oidset_clear(&d->sub[i].seen);
+	}
+	oidset_clear(&d->rhs_omits);
+	free(d);
+}
+
+static int should_delegate(enum list_objects_filter_situation filter_situation,
+			   struct object *obj,
+			   struct filter_combine_data *d,
+			   int side)
+{
+	if (!d->sub[side].is_skipping_tree)
+		return 1;
+	if (filter_situation == LOFS_END_TREE &&
+		oideq(&obj->oid, &d->sub[side].skip_tree)) {
+		d->sub[side].is_skipping_tree = 0;
+		return 1;
+	}
+	return 0;
+}
+
+static enum list_objects_filter_result filter_combine(
+	struct repository *r,
+	enum list_objects_filter_situation filter_situation,
+	struct object *obj,
+	const char *pathname,
+	const char *filename,
+	struct filter_context *ctx)
+{
+	struct filter_combine_data *d = ctx->data;
+	enum list_objects_filter_result result[2];
+	enum list_objects_filter_result combined_result = LOFR_ZERO;
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		if (oidset_contains(&d->sub[i].seen, &obj->oid) ||
+			!should_delegate(filter_situation, obj, d, i)) {
+			result[i] = LOFR_ZERO;
+			continue;
+		}
+
+		result[i] = d->sub[i].ctx.filter_fn(
+			r, filter_situation, obj, pathname, filename,
+			&d->sub[i].ctx);
+
+		if (result[i] & LOFR_MARK_SEEN)
+			oidset_insert(&d->sub[i].seen, &obj->oid);
+
+		if (result[i] & LOFR_SKIP_TREE) {
+			d->sub[i].is_skipping_tree = 1;
+			d->sub[i].skip_tree = obj->oid;
+		}
+	}
+
+	if ((result[0] & LOFR_DO_SHOW) && (result[1] & LOFR_DO_SHOW))
+		combined_result |= LOFR_DO_SHOW;
+	if (d->sub[0].is_skipping_tree && d->sub[1].is_skipping_tree)
+		combined_result |= LOFR_SKIP_TREE;
+
+	return combined_result;
+}
+
+static void filter_combine__init(
+	struct list_objects_filter_options *filter_options,
+	struct filter_context *ctx)
+{
+	struct filter_combine_data *d = xcalloc(1, sizeof(*d));
+
+	if (ctx->omits)
+		oidset_init(&d->rhs_omits, 16);
+
+	list_objects_filter__init(ctx->omits, filter_options->lhs,
+				  &d->sub[0].ctx);
+	list_objects_filter__init(&d->rhs_omits, filter_options->rhs,
+				  &d->sub[1].ctx);
+
+	ctx->filter_fn = filter_combine;
+	ctx->free_fn = filter_combine_free;
+	ctx->data = d;
+}
+
 typedef void (*filter_init_fn)(
 	struct list_objects_filter_options *filter_options,
 	struct filter_context *ctx);
 
 /*
  * Must match "enum list_objects_filter_choice".
  */
 static filter_init_fn s_filters[] = {
 	NULL,
 	filter_blobs_none__init,
 	filter_blobs_limit__init,
 	filter_trees_depth__init,
 	filter_sparse_oid__init,
 	filter_sparse_path__init,
+	filter_combine__init,
 };
 
 void list_objects_filter__init(
 	struct oidset *omitted,
 	struct list_objects_filter_options *filter_options,
 	struct filter_context *ctx)
 {
 	filter_init_fn init_fn;
 
 	assert((sizeof(s_filters) / sizeof(s_filters[0])) == LOFC__COUNT);
diff --git a/t/t6112-rev-list-filters-objects.sh b/t/t6112-rev-list-filters-objects.sh
index 9c11427719..ddfacb1a1a 100755
--- a/t/t6112-rev-list-filters-objects.sh
+++ b/t/t6112-rev-list-filters-objects.sh
@@ -284,21 +284,33 @@ test_expect_success 'verify tree:0 includes trees in "filtered" output' '
 # Make sure tree:0 does not iterate through any trees.
 
 test_expect_success 'verify skipping tree iteration when not collecting omits' '
 	GIT_TRACE=1 git -C r3 rev-list \
 		--objects --filter=tree:0 HEAD 2>filter_trace &&
 	grep "Skipping contents of tree [.][.][.]" filter_trace >actual &&
 	# One line for each commit traversed.
 	test_line_count = 2 actual &&
 
 	# Make sure no other trees were considered besides the root.
-	! grep "Skipping contents of tree [^.]" filter_trace
+	! grep "Skipping contents of tree [^.]" filter_trace &&
+
+	# Try this again with "combine:". If both sub-filters are skipping
+	# trees, the composite filter should also skip trees. This is not
+	# important unless the user does combine:tree:X+tree:Y or another filter
+	# besides "tree:" is implemented in the future which can skip trees.
+	GIT_TRACE=1 git -C r3 rev-list \
+		--objects --filter=combine:tree:1+tree:3 HEAD 2>filter_trace &&
+
+	# Only skip the dir1/ tree, which is shared between the two commits.
+	grep "Skipping contents of tree " filter_trace >actual &&
+	test_write_lines "Skipping contents of tree dir1/..." >expected &&
+	test_cmp expected actual
 '
 
 # Test tree:# filters.
 
 expect_has () {
 	commit=$1 &&
 	name=$2 &&
 
 	hash=$(git -C r3 rev-parse $commit:$name) &&
 	grep "^$hash $name$" actual
@@ -336,20 +348,134 @@ test_expect_success 'verify tree:3 includes everything expected' '
 	expect_has HEAD dir1/sparse1 &&
 	expect_has HEAD dir1/sparse2 &&
 	expect_has HEAD pattern &&
 	expect_has HEAD sparse1 &&
 	expect_has HEAD sparse2 &&
 
 	# There are also 2 commit objects
 	test_line_count = 10 actual
 '
 
+test_expect_success 'combine:... for a simple combination' '
+	git -C r3 rev-list --objects --filter=combine:tree:2+blob:none HEAD \
+		>actual &&
+
+	expect_has HEAD "" &&
+	expect_has HEAD~1 "" &&
+	expect_has HEAD dir1 &&
+
+	# There are also 2 commit objects
+	test_line_count = 5 actual
+'
+
+test_expect_success 'combine:... with URL encoding' '
+	git -C r3 rev-list --objects \
+		--filter=combine:tree%3a2+blob:%6Eon%65 HEAD >actual &&
+
+	expect_has HEAD "" &&
+	expect_has HEAD~1 "" &&
+	expect_has HEAD dir1 &&
+
+	# There are also 2 commit objects
+	test_line_count = 5 actual
+'
+
+expect_invalid_filter_spec () {
+	spec="$1" &&
+	err="$2" &&
+
+	test_must_fail git -C r3 rev-list --objects --filter="$spec" HEAD \
+		>actual 2>actual_stderr &&
+	test_must_be_empty actual &&
+	test_i18ngrep "$err" actual_stderr
+}
+
+test_expect_success 'combine:... while URL-encoding things that should not be' '
+	expect_invalid_filter_spec combine%3Atree:2+blob:none \
+		"invalid filter-spec"
+'
+
+test_expect_success 'combine: with nothing after the :' '
+	expect_invalid_filter_spec combine: "expected something after combine:"
+'
+
+test_expect_success 'parse error in first sub-filter in combine:' '
+	expect_invalid_filter_spec combine:tree:asdf+blob:none \
+		"expected .tree:<depth>."
+'
+
+test_expect_success 'combine:... with invalid URL-encoded sequences' '
+	expect_invalid_filter_spec combine:tree:2+blob:non%a \
+		"error in filter-spec - not enough hex digits after %" &&
+	# Edge cases for non-hex chars: "Gg/:"
+	expect_invalid_filter_spec combine:tree:2+blob%G5none \
+		"error in filter-spec - expect two hex digits .*: .G." &&
+	expect_invalid_filter_spec combine:tree:2+blob%g5none \
+		"error in filter-spec - expect two hex digits .*: .g." &&
+	expect_invalid_filter_spec combine:tree:2+blob%5/none \
+		"error in filter-spec - expect two hex digits .*: ./." &&
+	expect_invalid_filter_spec combine:%:5tree:2+blob:none \
+		"error in filter-spec - expect two hex digits .*: .:."
+'
+
+test_expect_success 'combine:... with non-encoded reserved chars' '
+	expect_invalid_filter_spec combine:tree:2+sparse:@xyz \
+		"must escape char in sub-filter-spec: .@." &&
+	expect_invalid_filter_spec combine:tree:2+sparse:\` \
+		"must escape char in sub-filter-spec: .\`." &&
+	expect_invalid_filter_spec combine:tree:2+sparse:~abc \
+		"must escape char in sub-filter-spec: .\~."
+'
+
+test_expect_success 'validate err msg for "combine:<valid-filter>+"' '
+	expect_invalid_filter_spec combine:tree:2+ "expected .tree:<depth>."
+'
+
+test_expect_success 'combine:... with edge-case hex digits: Ff Aa 0 9' '
+	git -C r3 rev-list --objects --filter="combine:tree:2+bl%6Fb:n%6fne" \
+		HEAD >actual &&
+	test_line_count = 5 actual &&
+	git -C r3 rev-list --objects --filter="combine:tree%3A2+blob%3anone" \
+		HEAD >actual &&
+	test_line_count = 5 actual &&
+	git -C r3 rev-list --objects --filter="combine:tree:%30" HEAD >actual &&
+	test_line_count = 2 actual &&
+	git -C r3 rev-list --objects --filter="combine:tree:%39+blob:none" \
+		HEAD >actual &&
+	test_line_count = 5 actual
+'
+
+test_expect_success 'combine:... with more than two sub-filters' '
+	git -C r3 rev-list --objects \
+		--filter=combine:tree:3+blob:limit=40+sparse:path=../pattern1 \
+		HEAD >actual &&
+
+	expect_has HEAD "" &&
+	expect_has HEAD~1 "" &&
+	expect_has HEAD dir1 &&
+	expect_has HEAD dir1/sparse1 &&
+	expect_has HEAD dir1/sparse2 &&
+
+	# Should also have 2 commits
+	test_line_count = 7 actual &&
+
+	# Try again, this time making sure the last sub-filter is only
+	# URL-decoded once.
+	cp pattern1 pattern1+renamed% &&
+	cp actual expect &&
+
+	git -C r3 rev-list --objects \
+		--filter=combine:tree:3+blob:limit=40+sparse:path=../pattern1%2brenamed%25 \
+		HEAD >actual &&
+	test_cmp expect actual
+'
+
 # Test provisional omit collection logic with a repo that has objects appearing
 # at multiple depths - first deeper than the filter's threshold, then shallow.
 
 test_expect_success 'setup r4' '
 	git init r4 &&
 
 	echo foo > r4/foo &&
 	mkdir r4/subdir &&
 	echo bar > r4/subdir/bar &&
 
@@ -379,20 +505,51 @@ test_expect_success 'test tree:# filter provisional omit for blob and tree' '
 
 test_expect_success 'verify skipping tree iteration when collecting omits' '
 	GIT_TRACE=1 git -C r4 rev-list --filter-print-omitted \
 		--objects --filter=tree:0 HEAD 2>filter_trace &&
 	grep "^Skipping contents of tree " filter_trace >actual &&
 
 	echo "Skipping contents of tree subdir/..." >expect &&
 	test_cmp expect actual
 '
 
+test_expect_success 'setup r5' '
+	git init r5 &&
+	mkdir -p r5/subdir &&
+
+	echo 1     >r5/short-root          &&
+	echo 12345 >r5/long-root           &&
+	echo a     >r5/subdir/short-subdir &&
+	echo abcde >r5/subdir/long-subdir  &&
+
+	git -C r5 add short-root long-root subdir &&
+	git -C r5 commit -m "commit msg"
+'
+
+test_expect_success 'verify collecting omits in combined: filter' '
+	# Note that this test guards against the naive implementation of simply
+	# giving both filters the same "omits" set and expecting it to
+	# automatically merge them.
+	git -C r5 rev-list --objects --quiet --filter-print-omitted \
+		--filter=combine:tree:2+blob:limit=3 HEAD >actual &&
+
+	# Expect 0 trees/commits, 3 blobs omitted (all blobs except short-root)
+	omitted_1=$(echo 12345 | git hash-object --stdin) &&
+	omitted_2=$(echo a     | git hash-object --stdin) &&
+	omitted_3=$(echo abcde | git hash-object --stdin) &&
+
+	grep ~$omitted_1 actual &&
+	grep ~$omitted_2 actual &&
+	grep ~$omitted_3 actual &&
+	test_line_count = 3 actual
+'
+
 # Test tree:<depth> where a tree is iterated to twice - once where a subentry is
 # too deep to be included, and again where the blob inside it is shallow enough
 # to be included. This makes sure we don't use LOFR_MARK_SEEN incorrectly (we
 # can't use it because a tree can be iterated over again at a lower depth).
 
 test_expect_success 'tree:<depth> where we iterate over tree at two levels' '
 	git init r5 &&
 
 	mkdir -p r5/a/subdir/b &&
 	echo foo > r5/a/subdir/b/foo &&
