Upload a SVG from CKEditor (image inline)

idimopoulos → made their first commit to this issue’s fork.

I added 1 more commit because there are cases for the inline editors that breaks the code.
This is for example when there are multiple text filter plugins, for example \Drupal\filter\Plugin\Filter\FilterAlign::process which adds the class using the dom element, thus adding it as a string.

That causes

        $variables['image']['#attributes']['class'][] = 'no-image-style';

to throw an exception. I am handling this case by splitting the class apart first.

Adding https://www.drupal.org/project/svg_image/issues/3321542 → as a related issue which was about the same thing mainly.