IE8 doesn't support `::before` and `::after` pseudo-elements. Replace them with `:before` and `:after`.

props andrezrv, DrewAPicture, ocean90.
fixes #28082.
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Formatting: no <p> or <br> around <option> tags in both flavours of wpautop, make "selects" easier to read in the Text editor. Fixes #28217.
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Formatting: make the removal of white space around <option> greedy, see #28217.
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git-svn-id: http://core.svn.wordpress.org/trunk@29097 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE:
- Use `data-wp-*` for processing and styling of the `more` and `nextpage` placeholders, keep the class names for back-compat. Makes them "immune" to "Clear formatting".
- Translate the titles of the placeholders.
Fixes #28772.
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git-svn-id: http://core.svn.wordpress.org/trunk@29098 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid PHP notices in _count_posts_cache_key(), _update_blog_date_on_post_publish(), and _update_blog_date_on_post_delete() if post type is not registered.

props jesin.
fixes #28135.
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git-svn-id: http://core.svn.wordpress.org/trunk@29099 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use 3-digit x.x.x style for two 4.0.0 @since versions.

see #28885.
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Avoid PHP notices in Media Library if an attachment parent post type no longer exists.

Synchronize the 'edit_post' capability check between the list table and the media grid.

fixes #27446.
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git-svn-id: http://core.svn.wordpress.org/trunk@29101 1a063a9b-81f0-0310-95a4-ce76da25c4cd
wpLink: add keyboard navigation, improve accessibility. Props afercia, fixes #28897.
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