[wp-trac] [WordPress Trac] #22080: add_theme_support should merge post-thumbnail post types by default (currently stomps)

[WordPress Trac]

#22080: add_theme_support should merge post-thumbnail post types by default
(currently stomps)
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 Reporter:  alexkingorg              |       Owner:
     Type:  enhancement              |      Status:  new
 Priority:  normal                   |   Milestone:  Future Release
Component:  Post Thumbnails          |     Version:  2.9
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-refresh  |     Focuses:
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Comment (by jmichaelward):

 The easiest way to replicate this issue is as follows:

 1. Install and activate WooCommerce. It registers a custom post type
 called `product` and adds post thumbnail support to all post types (so you
 can go to a Page, Post, or Product and see that you can attach an image).

 2. Create a new theme with a functions.php file, and enter
 `add_theme_support( 'post-thumbnail', array( 'post' ) );`.

 3. Click into a new or existing post, and confirm that you're able to
 attach a featured image.

 4. Click into a new or existing page or WooCommerce product, and note that
 you no longer have the ability to attach a featured image to these types.

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Ticket URL: <https://core.trac.wordpress.org/ticket/22080#comment:29>
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