From 150490d365a37b89d88a0e66ef6ec789bb4eb1c3 Mon Sep 17 00:00:00 2001
From: luukvbaal <luukvbaal@gmail.com>
Date: Sat, 11 Oct 2025 18:22:18 +0200
Subject: [PATCH] fix(conceal): assert tripped during startup #36136

Problem:  Row assertion for concealed lines trips during startup.
Solution: Remove the assertion and return early instead.
---
 src/nvim/decoration.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/nvim/decoration.c b/src/nvim/decoration.c
index e9e0e61331..5030c337aa 100644
--- a/src/nvim/decoration.c
+++ b/src/nvim/decoration.c
@@ -865,8 +865,7 @@ static const uint32_t conceal_filter[kMTMetaCount] = {[kMTMetaConcealLines] = kM
 /// @return whether "row" is concealed
 bool decor_conceal_line(win_T *wp, int row, bool check_cursor)
 {
-  assert(row >= 0);
-  if (wp->w_p_cole < 2
+  if (row < 0 || wp->w_p_cole < 2
       || (!check_cursor && wp == curwin && row + 1 == wp->w_cursor.lnum
           && !conceal_cursor_line(wp))) {
     return false;