MC-36942: HTML minification strips triple slashes from html string in phtml

Author: o-iegorov

lib/internal/Magento/Framework/View/Template/Html/Minifier.php

@@ -144,7 +144,7 @@ function ($match) use (&$heredocs) {
                             '#(?<!:|\\\\|\'|"|/)//(?!/)(?!\s*\<\!\[)(?!\s*]]\>)[^\n\r]*#',
                             '',
                             preg_replace(
-                                '#(?<!:|\'|")//[^\n\r]*(\?\>)#',
+                                '#(?<!:|\'|")//[^\n\r\<\?]*(\?\>)#',
                                 ' $1',
                                 preg_replace(
                                     '#(?<!:)//[^\n\r]*(\<\?php)[^\n\r]*(\s\?\>)[^\n\r]*#',