src/hb-ot-shape-complex-hangul.cc |    6 ++++++
 src/hb-ot-shape-complex-thai.cc   |    1 +
 2 files changed, 7 insertions(+)

New commits:
commit e43aad55524cc1d4008ce337c2863a8546706d2e
Author: Behdad Esfahbod <beh...@behdad.org>
Date:   Thu Aug 10 20:54:15 2017 -0700

    [unsafe-to-break] Flag in Thai PUA shaping

diff --git a/src/hb-ot-shape-complex-thai.cc b/src/hb-ot-shape-complex-thai.cc
index e75b3537..924247f1 100644
--- a/src/hb-ot-shape-complex-thai.cc
+++ b/src/hb-ot-shape-complex-thai.cc
@@ -244,6 +244,7 @@ do_thai_pua_shaping (const hb_ot_shape_plan_t *plan 
HB_UNUSED,
     /* At least one of the above/below actions is NOP. */
     thai_action_t action = above_edge.action != NOP ? above_edge.action : 
below_edge.action;
 
+    buffer->unsafe_to_break (base, i);
     if (action == RD)
       info[base].codepoint = thai_pua_shape (info[base].codepoint, action, 
font);
     else
commit eae009602b5503c53a7f8ab053912563a97bbfa4
Author: Behdad Esfahbod <beh...@behdad.org>
Date:   Thu Aug 10 20:50:48 2017 -0700

    [unsafe-to-break] Flag in Hangul shaper

diff --git a/src/hb-ot-shape-complex-hangul.cc 
b/src/hb-ot-shape-complex-hangul.cc
index 23e07e59..a90af3fd 100644
--- a/src/hb-ot-shape-complex-hangul.cc
+++ b/src/hb-ot-shape-complex-hangul.cc
@@ -202,6 +202,7 @@ preprocess_text_hangul (const hb_ot_shape_plan_t *plan,
       if (start < end && end == buffer->out_len)
       {
        /* Tone mark follows a valid syllable; move it in front, unless it's 
zero width. */
+        buffer->unsafe_to_break_from_outbuffer (start, buffer->idx);
        buffer->next_glyph ();
        if (!is_zero_width_char (font, u))
        {
@@ -258,6 +259,7 @@ preprocess_text_hangul (const hb_ot_shape_plan_t *plan,
          else
            t = 0; /* The next character was not a trailing jamo. */
        }
+       buffer->unsafe_to_break (buffer->idx, buffer->idx + (t ? 3 : 2));
 
        /* We've got a syllable <L,V,T?>; see if it can potentially be 
composed. */
        if (isCombiningL (l) && isCombiningV (v) && (t == 0 || isCombiningT 
(t)))
@@ -322,6 +324,8 @@ preprocess_text_hangul (const hb_ot_shape_plan_t *plan,
          end = start + 1;
          continue;
        }
+       else
+         buffer->unsafe_to_break (buffer->idx, buffer->idx + 2); /* Mark 
unsafe between LV and T. */
       }
 
       /* Otherwise, decompose if font doesn't support <LV> or <LVT>,
@@ -368,6 +372,8 @@ preprocess_text_hangul (const hb_ot_shape_plan_t *plan,
            buffer->merge_out_clusters (start, end);
          continue;
        }
+       else if (!tindex)
+         buffer->unsafe_to_break (buffer->idx, buffer->idx + 2); /* Mark 
unsafe between LV and T. */
       }
 
       if (has_glyph)
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