Custom image size not regenerating when image editted

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I have a custom image size at 200×150 that works fine in a plugin I’m working on. Uploading new files is no problem but when I edit an image, the default image sizes get regenerated but my custom size does not. Is there a way to force the regeneration programatically in a filter or something?

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  1. To regenerate custom image size when image is edited in image editor , You have to add following options in wp_options table using update_option function along with add_image_size.

    Example : 

    $img_size_name = 'custom-size'; // The new image size name.
if ( function_exists( 'add_theme_support' ) )
add_image_size($img_size_name, 100, 100 , true);

update_option($img_size_name.'_size_w', 100);
update_option($img_size_name.'_size_h', 100);
update_option($img_size_name.'_crop', 1);