Improve NXC TOC rendering performance

For some reason, the entity encoding helper from xml.el is about 10x
as slow as the one from url-util.el. On a particularly complicated NCX
file, this dropped rendering times from 3.9s to 1.1s...

1 files changed, 3 insertions, 3 deletions

diff --git a/nov.el b/nov.el
index 3fe78b6..7476b7e 100644
--- a/nov.el
+++ b/nov.el
@@ -50,7 +50,7 @@
 (require 'seq)
 (require 'shr)
 (require 'url-parse)
-(require 'xml)
+(require 'url-util)
 
 (require 'bookmark)
 (require 'easymenu)
@@ -406,8 +406,8 @@ Each alist item consists of the identifier and full path."
         (when (not href)
           (error "Navigation point is missing href attribute"))
         (let ((link (format "<a href=\"%s\">%s</a>"
-                            (xml-escape-string href)
-                            (xml-escape-string (or label href)))))
+                            (url-insert-entities-in-string href)
+                            (url-insert-entities-in-string (or label href)))))
           (if children
               (progn
                 (insert (format "<li>\n%s\n<ol>\n" link))