Support » Plugins » add_theme_support for post-thumbnails is destructive

  • It seems that when using add_theme_support for post-thumbnails in a plugin – which should have no knowledge of other plugins or post-types – overwrites current value for post-thumbnails.

    Here is my example code, where foo represents my custom posttype

    add_theme_support('post-thumbnails', array('post', 'foo'))

    Observe the code of wp-includes/theme.php here

    Notice, that in the case of 'post-thumbnails' it simply overwrites whatever has already been stored. What is the proper way to handle this in a plugin?

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