From 2bfdb8a3c1cce30dd230435f25df83bd9587bb8a Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Tue, 17 May 2022 01:58:26 +0100
Subject: [PATCH] Html: Fix Debug truncation to not randomly panic

Ow!

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 base/html.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/base/html.rs b/base/html.rs
index 85a8f521..bf540dbc 100644
--- a/base/html.rs
+++ b/base/html.rs
@@ -14,7 +14,9 @@ impl Debug for HtmlStr {
     if self.len() < MAX {
       write!(f, "<{}>", &self.0)
     } else {
-      write!(f, "<{}>...", &self.0[0..MAX-3])
+      let lim = (MAX-3 ..).into_iter()
+        .find(|&i| self.0.is_char_boundary(i)).unwrap();
+      write!(f, "<{}>...", &self.0[0..lim])
     }
   }
 }
-- 
2.30.2