From ba4108445ae9ed18cad481b987d907ebf3c323b0 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Fri, 1 May 2015 17:44:49 -0700
Subject: [PATCH] avoid wrapping shortfall due to surrogate pairs.

---
 lib/widget.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/widget.js b/lib/widget.js
index e70cc79..c44dc17 100644
--- a/lib/widget.js
+++ b/lib/widget.js
@@ -2846,6 +2846,17 @@ main:
           } else {
             // Try to find a character to break on.
             if (i !== line.length) {
+              // <XXX>
+              // Compensate for surrogate length
+              // counts on wrapping (experimental):
+              // NOTE: Could optimize this by putting
+              // it in the parent for loop.
+              if (unicode.isSurrogate(line, i)) i--;
+              for (var s = 0, n = 0; n < i; n++) {
+                if (unicode.isSurrogate(line, n)) s++, n++;
+              }
+              i += s;
+              // </XXX>
               j = i;
               // Break _past_ space.
               // Break _past_ double-width chars.