id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
15606	Remove Hardcoded Image Extensions	acumensystems		"Hi,

As the web changes, browsers support more image extensions. Part of what I'm doing is write plugins that extend Wordpress's ability to thumbnail beyond the norm (PDFs for example).

In order to extend functionality and provide the most support to existing themes, one way is to override functions like `wp_attachment_is_image()`. Rather than full overriding, it would be better still to change the data their logic is based on. However, these functions do make some unfortunate hard-coded assumptions.

This function, in wp-includes/post.php includes the code:
{{{
$image_exts = array('jpg', 'jpeg', 'gif', 'png');
}}}

I believe that should refer to a global array. This is not in object scope, so where would be best to place it?

Best,
Leo"	enhancement	new	normal	Future Release	Media		normal