id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
22906,Captions should be responsive,maxwell.shim,,"Problem 1 : Does not resize image with caption for a responsive design.

Returns the fixed width of the image function img_caption_shortcode() 
So does not change the image width. 

I think change style max-width.
{{{
return '<div ' . $id . 'class=""wp-caption ' . esc_attr($align) . '"" style=""max-width: ' . (10 + (int) $width) . 'px"">'
}}}",enhancement,closed,normal,,Media,3.5,trivial,wontfix,,