Unrestricted height thumbnails

According to add_image_size() you can do something like that with width but I imagine it works the same with height:

$width

(int) (optional) The post thumbnail width in pixels. Set to 9999 to resize based on $height
Default: 0

Really I think you would want to set it to something ridiculously high which 9999 should work for you. You could test this and use a plugin like Regenerate Thumbnails to try it out or revert your changes if it doesn’t work.

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