get_post_class() do not set 'sticky' class in administration posts table

[corsonr]

get_post_class() does set a 'sticky' class to sticky post on the frontend but not in the administration. So, there's no way to differentiate a sticky post from another non-sticky post excepted the span element to its right.

Adding something similar to this fix the problem:

	// sticky for Sticky Posts in administration
	if ( is_sticky($post->ID) && is_admin() )
		$classes[] = 'post-sticky';

[DrewAPicture]

This seems like an easy win. I'd say +1, except I wonder if there other existing instances of applying post classes in the admin and if so, what are their use-cases in core?

[corsonr]

Here is an simple example i did with this plugin: ​http://remicorson.com/color-my-posts/

[mordauk]

Adds "post-sticky" class for sticky posts in the admin list tables.

[corsonr]

here is another sample of how this can be used, ​http://codecanyon.net/item/color-my-posts-pro/3653526

[netweb]

Use 'status-' prefix rather than 'post-' for consistent admin post_status classes

[helen]

Related: #26928

[SergeyBiryukov]

In 29003:

Add 'status-sticky' class in get_post_class() for sticky posts in the admin.

props mordauk, netweb.
fixes #22590.