Broken svg element with "Auto convert linebreaks" (autop) filter

Problem/Motivation

See parent issue https://www.drupal.org/project/drupal/issues/2925487 for Drupal 7.

When inserting an svg with ckeditor, that has a text format which automatically converts linebreaks to
and

, svg elements can become broken because the linebreak withing the element is replaced by a
tag.

This issue also occurs when trying to insert a fontawesome icon as svg via the fontawesome contrib module.

Example:

<svg height="333" width="333" xmlns="http://www.w3.org/2000/svg">
     <line style="stroke:rgb(255,0,0);stroke-width:3" x1="0" x2="333" y1="0" y2="333"></line>
</svg>

Proposed resolution

In the "_filter_autop" method, the svg tag needs to be included in the ignored chunks.

$chunks = preg_split('@(<!--.*?-->|</?(?:pre|script|style|object|iframe|drupal-media|svg|!--)[^>]*>)@i', $text, -1, PREG_SPLIT_DELIM_CAPTURE);