Minify CSS removes spaces from SVG background-image

YUI CSS compressor does extract data URLs with the regex

Pattern p = Pattern.compile("(?i)url\\(\\s*([\"']?)data
:");

XWiki-platform code starting the minification: https://github.com/xwiki/xwiki-platform/blob/6096b83777fb3a12f9bcc3b9992ddd58f2fbd32a/xwiki-platform-core/xwiki-platform-skin/xwiki-platform-skin-skinx/src/main/java/com/xpn/xwiki/web/sx/CssExtension.java#L63-L65