From 4cb17f5ae65e129765794986d36fbfc33c0c65bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Wed, 24 Dec 2025 11:33:28 +0100
Subject: [PATCH] csi: make sure the ASCII printer function is updated on plain
 underlines

Otherwise, a sequence like

    \E[4:2;4m  # Enable double-underline, then immediately switch to single

Will switch to the slow printer, and then get stuck there even though
we immediately switch to plain underlines (which don't need the slow
printer).
---
 csi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/csi.c b/csi.c
index 7e0cf464..0cf8e203 100644
--- a/csi.c
+++ b/csi.c
@@ -117,9 +117,9 @@ csi_sgr(struct terminal *term)
                         style > UNDERLINE_SINGLE;
                     break;
                 }
-
-                term_update_ascii_printer(term);
-            }
+            } else
+                term->bits_affecting_ascii_printer.underline_style = false;
+            term_update_ascii_printer(term);
             break;
         }
         case 5: term->vt.attrs.blink = true; break;