ENGCOM-2412: [Backport] Issue 5316 #16916

Author: VladimirZaets

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

@@ -131,8 +131,8 @@ public function minify($file)
                             '#(?<!:|\\\\|\'|")//(?!\s*\<\!\[)(?!\s*]]\>)[^\n\r]*#',
                             '',
                             preg_replace(
-                                '#(?<!:|\'|")//[^\n\r]*(\s\?\>)#',
-                                '$1',
+                                '#(?<!:|\'|")//[^\n\r]*(\?\>)#',
+                                ' $1',
                                 preg_replace(
                                     '#(?<!:)//[^\n\r]*(\<\?php)[^\n\r]*(\s\?\>)[^\n\r]*#',
                                     '',

lib/internal/Magento/Framework/View/Test/Unit/Template/Html/MinifierTest.php

@@ -156,6 +156,11 @@ public function testMinify()
         <?php echo '//some.link.com/' ?>
         <em>inline text</em>
         <a href="http://www.<?php echo 'hi' ?>"></a>
+        <?php// if (\$block->getSomeVariable() > 1):?>
+            <?php echo \$block->getChildHtml('someChildBlock'); ?>
+        <?php //else:?>
+            <?php // echo \$block->getChildHtml('anotherChildBlock'); ?>
+        <?php // endif; ?>
     </body>
 </html>
 TEXT;
@@ -179,7 +184,7 @@ public function testMinify()
                 }
             });
             //]]>
-</script><?php echo "http://some.link.com/" ?> <?php echo "//some.link.com/" ?> <?php echo '//some.link.com/' ?> <em>inline text</em> <a href="http://www.<?php echo 'hi' ?>"></a></body></html>
+</script><?php echo "http://some.link.com/" ?> <?php echo "//some.link.com/" ?> <?php echo '//some.link.com/' ?> <em>inline text</em> <a href="http://www.<?php echo 'hi' ?>"></a> <?php ?> <?php echo \$block->getChildHtml('someChildBlock'); ?> <?php ?> <?php ?> <?php ?></body></html>
 TEXT;
 
         $this->appDirectoryMock->expects($this->once())