servo: Merge #7429 - Fixed serialize_list to no longer append an additional space at the e… (from GyrosOfWar:serialize_list_space_fix); r=jdm

…nd of the string.

Fixes #7404

Source-Repo: https://github.com/servo/servo
Source-Revision: e1ede2074d2ceb74c0d9f38b23697f17dc3a8fc9

servo/components/script/dom/cssstyledeclaration.rs

@@ -20,6 +20,7 @@ use util::str::DOMString;
 use std::ascii::AsciiExt;
 use std::borrow::ToOwned;
 use std::cell::Ref;
+use std::slice::SliceConcatExt;
 
 // http://dev.w3.org/csswg/cssom/#the-cssstyledeclaration-interface
 #[dom_struct]
@@ -50,9 +51,8 @@ macro_rules! css_properties(
 );
 
 fn serialize_list(list: &[Ref<PropertyDeclaration>]) -> DOMString {
-    list.iter().fold(String::new(), |accum, ref declaration| {
-        accum + &declaration.value() + " "
-    })
+    let strings: Vec<_> = list.iter().map(|d| d.value()).collect();
+    strings.join(" ")
 }
 
 impl CSSStyleDeclaration {

servo/components/script/lib.rs

@@ -30,6 +30,7 @@
 #![feature(str_utf16)]
 #![feature(unicode)]
 #![feature(vec_push_all)]
+#![feature(slice_concat_ext)]
 
 #![deny(unsafe_code)]
 #![allow(non_snake_case)]