Support » Plugin: Featured Image by URL » Overwritting thumbnail with url function strips original classes

  • Hi, first of all thanks for a great plugin!

    I try to get the correct setup for both thumbnail resising using Jetpack and lazy loading using any 3rd party plugin. After some investigation I have noticed, that in order to work this properly, attachment-$size and size-$size classes have to be preserved in the original img tag generated by the theme.

    But, your plugin function knawatfibu_overwrite_thumbnail_with_url strips all original img tag classes and replaces them with ‘external-img wp-post-image ‘.

    Is it possible to modify the function in a way that the external-img class was added to existing classes? For example:

    Original img tag classes: ‘attachment-my-thumbsize size-my-thumbsize wp-post-image’
    Updated img tag classes: ‘attachment-my-thumbsize size-my-thumbsize wp-post-image external-img’

    I am not a PHP expert and do not dare to modify the plugin code…

    I hope I am clear, sorry for my English.

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