[subset] use glyphset_gsub instead of glyphset for GDEF

src/hb-ot-layout-gdef-table.hh

@@ -84,7 +84,7 @@ struct AttachList
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    const hb_set_t &glyphset = *c->plan->glyphset ();
+    const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
     const hb_map_t &glyph_map = *c->plan->glyph_map;
 
     auto *out = c->serializer->start_embed (*this);
@@ -371,7 +371,7 @@ struct LigCaretList
   bool subset (hb_subset_context_t *c) const
   {
     TRACE_SUBSET (this);
-    const hb_set_t &glyphset = *c->plan->glyphset ();
+    const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
     const hb_map_t &glyph_map = *c->plan->glyph_map;
 
     auto *out = c->serializer->start_embed (*this);

test/subset/data/Makefile.am

@@ -30,6 +30,7 @@ EXTRA_DIST += \
 	expected/layout.gsub8 \
 	expected/layout.khmer \
 	expected/layout.gdef \
+	expected/layout.gdef.glyphset \
 	expected/layout.context \
 	expected/layout.gdef-varstore \
 	expected/layout.gdef-attachlist \

test/subset/data/Makefile.sources

@@ -16,6 +16,7 @@ TESTS = \
 	tests/layout.gdef-attachlist.tests \
 	tests/layout.gdef-varstore.tests \
 	tests/layout.gdef.tests \
+	tests/layout.gdef.glyphset.tests \
 	tests/layout.gpos.tests \
 	tests/layout.gpos2.tests \
 	tests/layout.gpos3.tests \

test/subset/data/tests/layout.gdef.glyphset.tests

@@ -0,0 +1,11 @@
+FONTS:
+IndicTestHowrah-Regular.ttf
+
+PROFILES:
+default.txt
+drop-hints.txt
+retain-gids.txt
+
+SUBSETS:
+U+9dd
+*

test/subset/meson.build

@@ -21,6 +21,7 @@ tests = [
   'layout.gsub6',
   'layout.gsub8',
   'layout.gdef',
+  'layout.gdef.glyphset',
   'layout.khmer',
   'layout.context',
   'layout.gdef-varstore',