From 587b70706960d8cb6292ca8ef3953062bbfbf11d Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Wed, 18 Dec 2024 16:08:51 +0100
Subject: [PATCH] fix: crash if pos_to_width is given an out of range value

Possible with bad lsp diagnostics for example.
---
 src/buffer/Buffer.zig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/buffer/Buffer.zig b/src/buffer/Buffer.zig
index 2ca5a5a..a5370b1 100644
--- a/src/buffer/Buffer.zig
+++ b/src/buffer/Buffer.zig
@@ -175,7 +175,10 @@ pub const Leaf = struct {
             } else {
                 const bytes = metrics.egc_length(metrics, buf, &cols, abs_col);
                 buf = buf[bytes..];
-                pos.* -= bytes;
+                if (pos.* >= bytes)
+                    pos.* -= bytes
+                else
+                    pos.* = 0;
             }
             col += @intCast(cols);
             abs_col += @intCast(cols);