Apply image style dimensions with HTML attributes

The patch provided in #3126330-3: Apply image style dimensions with HTML attributes didn't apply anymore to the latest version, so I've updated the code and created a merge request.

Same as GaëlG.
MR from #5 tested and confirmed to work.
Waiting for this to be available in the next stable release.
Meanwhile is it possible to have a patch?

@clemorphy, thanks for testing (and GaëlG, but you wrote the initial code). You can download a plain diff from the merge request. See the plain diff link under the issue fork list at the top of this page (left beside the green "MR !25 mergeable"). For additional information, see https://www.drupal.org/docs/develop/git/using-gitlab-to-contribute-to-dr...

Re-rolling the patch for latest version.

Looks like I have merged it too quickly.

Styling doesn't seem to work on my side.

          $dimensions = [
            'width' => $item->width,
            'height' => $item->height,
          ];

width and height seem to be always NULL here...

Aren't we supposed to extract the size from the SVG file itself as it is done in the widget?

@gaëlg an idea?

@gaëlg this code seems to work, could we switch to it?

    if (empty($attributes['width']) && empty($attributes['height']) && isset($imageStyle)) {
        // Determine the dimensions of the styled image.
        $dimensions = svg_image_get_image_file_dimensions($file);
        $imageStyle->transformDimensions($dimensions, $file->getFileUri());
        $attributes['width'] = $dimensions['width'];
        $attributes['height'] = $dimensions['height'];
    }

Or may be the MR code is trying to do something different that I am missing?

Without any feedback in the coming hours, I will merge MR 40 to rollback MR 25.