Cannot use spacebar to trigger OK button or links in Publish widget (eg. schedule settings)

[Daedalon]

When changing the scheduled publishing time of a post, the OK button after the time fields cannot be triggered by pressing spacebar.

The same applies to all buttons and links in the Publish widget on the Add New / Edit Post page. The Add button in the Tags widget on the same page can be triggered with space since WordPress 3.5.

Steps to repeat:

1. Create a new post by navigating to wp-admin/post-new.php.
2. Click the underlined link in "Publish immediately _Edit_" in the Publish widget.
3. Click the last field (minutes).
4. Press Tab once to move focus to the OK button.
5. Press spacebar.

What happens is the screen scrolling down exactly as if Page Down was pressed.

What should happen is the same that happens when the button (or link) is clicked with mouse, which depends on the button (or link).

Tested on Windows XP & 7 and all the recent Firefoxes I can remember and Internet Explorer 9.

Tested on Fedora 18 with Firefox 20. Issue persists!