Add API for setting invisible-codepoint
Fixes https://github.com/harfbuzz/harfbuzz/issues/1216
New API:
hb_buffer_set_invisible_codepoint()
hb_buffer_get_invisible_codepoint()
hb-shape / hb-view --invisible-codepoint
diff --git a/src/hb-buffer.hh b/src/hb-buffer.hh
index 33ddcbc..9126822 100644
--- a/src/hb-buffer.hh
+++ b/src/hb-buffer.hh
@@ -93,6 +93,7 @@
hb_buffer_flags_t flags; /* BOT / EOT / etc. */
hb_buffer_cluster_level_t cluster_level;
hb_codepoint_t replacement; /* U+FFFD or something else. */
+ hb_codepoint_t invisible; /* 0 or something else. */
hb_buffer_scratch_flags_t scratch_flags; /* Have space-fallback, etc. */
unsigned int max_len; /* Maximum allowed len. */
int max_ops; /* Maximum allowed operations. */
