[otlayout] Add HB_OT_LAYOUT_GLYPH_PROPS_LIGATED
Currently unused.
diff --git a/src/hb-ot-layout-private.hh b/src/hb-ot-layout-private.hh
index 1da4400..c37117b 100644
--- a/src/hb-ot-layout-private.hh
+++ b/src/hb-ot-layout-private.hh
@@ -50,8 +50,11 @@
HB_OT_LAYOUT_GLYPH_PROPS_MARK = 0x08u,
/* The following are used internally; not derived from GDEF. */
- HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED = 0x10u
+ HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED = 0x10u,
+ HB_OT_LAYOUT_GLYPH_PROPS_LIGATED = 0x20u,
+ HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE = HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED |
+ HB_OT_LAYOUT_GLYPH_PROPS_LIGATED
} hb_ot_layout_glyph_class_mask_t;