Better handling of posts without titles in Bulk Edit

[nacin]

Start a Bulk Edit that includes a post with a single space for a title (which is shown as "(no title)"), and the Bulk Edit title won't display it as "(no title)".

That's because the title on the Edit screen is run through _draft_or_post_title, which checks get_the_title, running those filters (including trim).

On the other hand, the title in inline post data is simply $post->post_title. Patch attached to instead use get_the_title.

Patch doesn't use _draft_or_post_title() because that would add "(no title)" to a Quick Edit of a post without a title.

For reference, it's not as edge of a case as you might think. Somehow, a line break made its way into the title field, so the title looked empty, and get_the_title evaluated it to empty, but $post->post_title didn't echo it as empty.

(In [13079]) Ensure post titles are consistently sanitized and filtered when displaying them in Bulk Edit, fixes #11307.