Display consistent preview links for drafts.

props mordauk.
fixes #28350.
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Force a separator in get_wp_title_rss() if it was inadvertently filtered out by the theme.

fixes #22362.
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Avoid a PHP notice in wp_new_comment() if user ID is not passed.

see #23231.
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Pass $url parameter to wp_embed_defaults() and 'embed_defaults' filter.

props wpsmith, sabreuse, jacobdubail.
fixes #20151.
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Document @return value for load_plugin_textdomain(). props jdgrimes.

Document $path parameter for load_child_theme_textdomain().

fixes #28690.
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Avoid overwriting $error global with an interim variable.

props MikeLittle.
fixes #28691.
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Support descriptions for individual customizer controls.

* Control title (label) markup will also only be output if specified.
* Control section descriptions are no longer italicized for visual hierarchy / differentiation.

props celloexpressions. fixes #27981.

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Replace a redundant ! is_preview() check with a more appropriate one.

fixes #20496.
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Remove obsolete comment in `wptexturize()`.

http://irclogs.wordpress.org/chanlog.php?channel=wordpress-dev&day=2014-06-30&sort=asc#m879104

See [28831].

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Customizer: Support `textarea` and commonly-used input types as control type in `WP_Customize_Control`.
Add `input_attrs` property to support custom input attributes.

(Demo plugin attached to ticket.)

props celloexpressions.
fixes #28477.
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Customizer: Reverse arrows in RTL. See #27406.

props yoavf.
fixes #28669.
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TinyMCE:
- Update the 'paste' plugin including https://github.com/tinymce/tinymce/commit/cb36a78e544132ff58e96c4df168094b1a9960b1
- Better filtering of WebKit inserted &nbsp.
- Remove empty paragraphs and all inline styles on pasting but preserve styles added in the editor. This brings back the WP 3.8 behavior and makes pasting in all browsers work the same.
See #28016
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Remove free-spacing modifier and extra spaces from wp_extract_urls() pattern.

fixes #28222.
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Move ms-load.php and ms-default-constants.php inclusion back to ms-settings.php to avoid breaking WP-CLI.

Use require_once() to allow for ms-settings.php to be included multiple times while testing.

props jeremyfelt.
see #27884.
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WP_Date_Query: The inclusive logic should include all times within the date range.

props mboynes, oso96_2000, DrewAPicture.
fixes #26653.
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General inline documentation improvements in wp-includes/functions.php.

Second run. See #26185.

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