Restored Drafts Shouldn't Have a Publication Date

[miqrogroove]

After creating a draft, trashing it, and then restoring it, the post editor shows a "Publish on" date as though it were a scheduled post, and the Date value in the list of all posts will be wrong after further editing (e.g. "3 hours ago, Last Modified").

[SergeyBiryukov]

Related: #19907

[miqrogroove]

Nacin and I noticed the related date issues while fixing #21858. There seems to be a lot of confusion about which value is supposed to go into each of the date fields.

[danielbachhuber]

The timestamp is set because of this block:

	if ( empty($post_date_gmt) || '0000-00-00 00:00:00' == $post_date_gmt ) {
		if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) )
			$post_date_gmt = get_gmt_from_date($post_date);
		else
			$post_date_gmt = '0000-00-00 00:00:00';
	}

Similarly, if you trash a 'draft' and haven't yet set a slug / post_name, the slug / post_name will be set when you restore it from trash.

Related #18362

[SergeyBiryukov]

Related: #15930, #23022.

[Denis-de-Bernardy]

Dup of #19907 (it has a patch that fixes this.)