From e1368639390e1cbf8b9aa4cf81cc167c8a640b6c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Mon, 24 Apr 2017 19:28:11 +0200
Subject: [PATCH] stylo: Fix a serialization bug for string pseudos.

The string is null-terminated, so we need to avoid passing that last null
character.
---
 components/style/gecko/selector_parser.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/components/style/gecko/selector_parser.rs b/components/style/gecko/selector_parser.rs
index e87336669d5..95b7ab82ac5 100644
--- a/components/style/gecko/selector_parser.rs
+++ b/components/style/gecko/selector_parser.rs
@@ -235,8 +235,12 @@ impl ToCss for NonTSPseudoClass {
                     $(NonTSPseudoClass::$s_name(ref s) => {
                         write!(dest, ":{}(", $s_css)?;
                         {
+                            // FIXME(emilio): Avoid the extra allocation!
                             let mut css = CssStringWriter::new(dest);
-                            css.write_str(&String::from_utf16(&s).unwrap())?;
+
+                            // Discount the null char in the end from the
+                            // string.
+                            css.write_str(&String::from_utf16(&s[..s.len() - 1]).unwrap())?;
                         }
                         return dest.write_str(")")
                     }, )*