From 3f1942223b071318c7e61c8d1786d4ca7e526d3c Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Tue, 6 Sep 2022 14:26:43 -0700
Subject: [PATCH] only test presentation VS15/16 if directly adjacent to
 codepoint

---
 src/font/Shaper.zig | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/font/Shaper.zig b/src/font/Shaper.zig
index 63eb4a482..4dd03c990 100644
--- a/src/font/Shaper.zig
+++ b/src/font/Shaper.zig
@@ -177,8 +177,10 @@ pub const RunIterator = struct {
 
             // Determine the presentation format for this glyph.
             const presentation: ?Presentation = if (cell.attrs.grapheme) p: {
+                // We only check the FIRST codepoint because I believe the
+                // presentation format must be directly adjacent to the codepoint.
                 var it = self.row.codepointIterator(j);
-                while (it.next()) |cp| {
+                if (it.next()) |cp| {
                     if (cp == 0xFE0E) break :p Presentation.text;
                     if (cp == 0xFE0F) break :p Presentation.emoji;
                 }