From e20564791e538249c99b65bf8457d3a29df9c981 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <m@mitchellh.com>
Date: Wed, 5 Aug 2026 14:32:43 -0700
Subject: [PATCH] libghostty-vt: spacer-tail handling needs to respect slow
 runtime safety

Debug libghostty-vt dependencies embedded in ReleaseFast or ReleaseSmall
binaries no longer panic when narrow text overwrites the tail of a wide
glyph.

Replace the root module's std.debug.runtime_safety gate with
build_options.slow_runtime_safety so mixed optimization modes use the
dependency's safety configuration consistently.
---
 src/terminal/Terminal.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/terminal/Terminal.zig b/src/terminal/Terminal.zig
index 4120e48c9..bbc117a19 100644
--- a/src/terminal/Terminal.zig
+++ b/src/terminal/Terminal.zig
@@ -1558,7 +1558,7 @@ fn printCell(
 
                 // So integrity checks pass. We fix this up later so we don't
                 // need to do this without safety checks.
-                if (comptime std.debug.runtime_safety) {
+                if (comptime build_options.slow_runtime_safety) {
                     cell.wide = .narrow;
                 }