[Backport] Issue 5316

[ronak2ram]

Original Pull Request

#16332

Description

Fix HTML minification problem, when there is a php a comment and no space at the php end tag

Fixed Issues (if relevant)

1. [2.1.0] HTML minification problem with php tag with a comment and no space at the end #5316: [2.1.0] HTML minification problem with php tag with a comment and no space at the end

Manual testing scenarios

1. Create a theme and a template file which contains this:

<?php //if ($showDescription):?>
    <div class="product description product-item-description">
        <?php /* @escapeNotVerified */ echo $_helper->productAttribute($_product, $_product->getShortDescription(), 'short_description') ?>
    </div>
<?php //endif; ?>

2. Enable HTML minification in the backend
3. Re-deploy static content and view_preprocessed in order to generate minified templates
4. Check the front page, where template is used.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @ronak2ram. Thank you for your contribution.
We will aim to release these changes as part of 2.1.15.
Please check the release notes for final confirmation.