Fix parse error in PHP 5.2.

props georgestephanis.
see #20276.
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Update some inline docs for the `WP_Http` class. Fixes #28943.
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WP_Session_Tokens: Can't abstract a static method.

Implementations can choose to implement the drop_sessions() method on their own.

see #20276.

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Plugin install: display cards in groups if the API returns them with the appropriate information. props tellyworth. fixes #28673.

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Add 'Details' links to installed plugins.

Installed plugins that are up to date are now returned in the update-check API response.

props tellyworth.
see #17902.

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Plugin Install screens: Pass locale and installed plugins to the API, for context.

props tellyworth.
see #17902.

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4.0-beta2.

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Fix syntax for single- and multi-line comments in wp-includes/class-http.php.

See #28943 and #28931.

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Convert documentation for default arguments in `WP_Http::request()` to a hash notation.

Also update corresponding docs for functions that leverage its arguments.

See #28298.

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TinyMCE: better "color preview" for the text color button, props avryl, fixes #28280.
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Add screen reader text for star ratings on Install Plugins screen.

props joedolson.
fixes #28852.
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Reverse the order of roles in help text on Add New User screen to match [25695].

fixes #28914.
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Use an existing string.

see #19205.
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Revert [28963].

see #28006.
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TinyMCE wpView:
- Typing something replaces a selected view.
- Pressing backspace deletes the selection.
- Pressing enter also deletes the selection.
- Pasting something replaces the selection.
- Also merge the different 'keydown' handlers.
Props avryl, fixes #28913.
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Customizer: Avoid losing focus when adding widgets via keyboard.

props sathishn.
fixes #28835.
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Customizer: Add widget title to Move/Up/Down controls to provide context for screen readers when reordering or moving widgets.

fixes #28889.
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Add screen reader text to announce that menu item accordion sections are expandable. Remove redundant title attribute.

props joedolson.
fixes #28866.
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Customizer: Add screen reader text to announce that panels and sections are expandable.

props joedolson, ocean90.
fixes #27591.
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Add a class for get_comment_author_link() in Recent Comments widget.

props DrewAPicture, dannydehaan, 5um17.
fixes #27944.
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