From 5b314478113754e46de40a9cdc6909e4415fe2d5 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Thu, 18 Jan 2024 07:27:00 +0800
Subject: [PATCH] fix(drawline): update prev_ptr after getting syntax attrs
 (#27072)

---
 src/nvim/drawline.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/nvim/drawline.c b/src/nvim/drawline.c
index e8c41cb608..7fe7e6f403 100644
--- a/src/nvim/drawline.c
+++ b/src/nvim/drawline.c
@@ -1923,6 +1923,7 @@ int win_line(win_T *wp, linenr_T lnum, int startrow, int endrow, int col_rows, s
         // Get extmark and syntax attributes, unless still at the start of the line
         // (double-wide char that doesn't fit).
         v = ptr - line;
+        const ptrdiff_t prev_v = prev_ptr - line;
         if (has_syntax && v > 0) {
           // Get the syntax attribute for the character.  If there
           // is an error, disable syntax highlighting.
@@ -1947,6 +1948,7 @@ int win_line(win_T *wp, linenr_T lnum, int startrow, int endrow, int col_rows, s
           // have made it invalid.
           line = ml_get_buf(wp->w_buffer, lnum);
           ptr = line + v;
+          prev_ptr = line + prev_v;
 
           // no concealing past the end of the line, it interferes
           // with line highlighting.