This plugin will regenerate all missing image sizes for an image when it's chosen as a featured image for any post. Very useful when you change your template.
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README.md
featured-image-resize.php
readme.txt

README.md

Featured Image Resize

This is a wordpress plugin that will regenerate all missing image sizes for an image when it's chosen as a featured image for any post. Very useful when you change your template. No settings whatsoever, just activate and forget.

You can find this plugin on wordpress.org here.