Widget Customizer: Cleanup `wp.customize.Widgets.SidebarControl`.

see #27690.
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Add missing parameter descriptions to the PHPDocs for `WP_Upgrader_Skin::decrement_update_count()` and `Bulk_Upgrader_Skin::decrement_update_count()`.

See #27700.

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Align parameters in the hook docs for the `attachment_thumbnail_args` filter.

See #27700.

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Use the correct parameter variables in the hook docs for `wp_upgrade`.

See #27700.

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Don't try to resolve symlinks for single-file plugins. plugins_url() should not be used in this context anyway.

props rmccue.
fixes #16953.

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Use suggested language conventions in the hook docs description for the `theme_page_templates` filter.

See #27700.

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Improve PHPDoc formatting for `get_the_permalink()`.

See #27700.

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wpdb: Don't pass a second argument to mysqli_fetch_field().

props pento.
fixes #27693.

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Space vs tab in function descriptions for `wp_underscore_audio_template()` and `wp_underscore_video_template()`.

See #27700.

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General PHPDoc improvements in wp-includes/media.php for 3.9 functionality.

See #27700.

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Widget Customizer: Update icons to new Dashicons.

props melchoyce.
see #27400.
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Inline documentation improvements in wp-includes/ms-load.php for 3.9 functionality.

Clarifies some mixed type parameters, spacing and comment style, and language fixes.

See #27700.

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Inline documentation fixes related to the `determine_current_user` filter

See #26706, #27700.

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Gallery Views: Avoid JS errors when image attachments lack metadata.

props gcorne.
fixes #27691.

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Formally deprecate wpmu_current_site().

props jeremyfelt.
fixes #27702.

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Improve inline documentation for functionality in wp-includes/plugin.php added in 3.9.

See #14994, #27700.

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Add a missing `@since 3.9.0` to the PHPDoc for `wp_register_plugin_realpath()`.

See #16953, #27700.

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TinyMCE: show an error in the console when a plugin attempts to use the 'wpdialogs' plugin but wpdialog.js is not enqueued, fixes #16284
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Widget Customizer: Update icons to new Dashicons, part 2.

props Michael Arestad.
fixes #27400.
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Fix PHPDoc formatting for `WP_Rewrite::add_endpoint()`.

See #27700.

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