Re-sizing breaks after initial save or preview

Added a possible fix as an MR. If others could please test. Thanks

I appreciate the work on this, wysiwyg image resizing is fundamental to content editing.

That said this patch did not work when I tested, looking at the patch the $node->setAttribute call changing the data-view-mode attribute is negated by a following change of that attribute. Changing the order also didn't get it working for me though.

@damondt The only place I can see it being set somewhere else is here

    if ($apply_image_styles) {
      $view_mode = $this->getViewModeByWidth($width, $ckeditor5_plugin_config);
      if ($view_mode) {
        $node->setAttribute('data-view-mode', $view_mode);
      }
    }

But that code only runs when your not in the editor because $apply_image_styles is only set to true outside of the editor

    // Apply image styles only if the corresponding setting in the text format
    // configuration is enabled and if the filter is NOT processing during the
    // loading of the text inside the ckeditor.
    $apply_image_styles = !empty($ckeditor5_plugin_config['apply_image_styles']) && !$processing_in_editor;

Make sure you have the filtering order is set correctly for the text format your using. The Resize media images filter needs to run before the Embed media filter.