From 3d90b199ad90e1b7f272411eb04a4f1293ed8c73 Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Sat, 13 Sep 2025 15:45:17 +0200
Subject: [PATCH] fix: do not return zero width codepoints from egc_at

Skip them and return the next non-zero width codepoint. This makes more sense and
prevents endless loops in code that scans by egc width using egc_at, like
Cursor.move_right_until for example.
---
 src/buffer/Buffer.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/buffer/Buffer.zig b/src/buffer/Buffer.zig
index ddcf889..7d6c5d9 100644
--- a/src/buffer/Buffer.zig
+++ b/src/buffer/Buffer.zig
@@ -538,7 +538,7 @@ const Node = union(enum) {
                 const ctx = @as(*@This(), @ptrCast(@alignCast(ctx_)));
                 ctx.at = egc;
                 ctx.wcwidth = wcwidth;
-                if (ctx.col == 0 or egc[0] == '\n' or ctx.col < wcwidth)
+                if (wcwidth > 0 and (ctx.col == 0 or egc[0] == '\n' or ctx.col < wcwidth))
                     return Walker.stop;
                 ctx.col -= wcwidth;
                 return Walker.keep_walking;