Pass comment ID and comment post ID to get_comment_class() in WP_Comments_List_Table::single_row().

props drozdz.
fixes #25814.
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Twenty Thirteen: capitalize "Not Found" string for use in a page title, see #24891 and r25907.
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Twenty Fourteen: update bundled Genericons to the latest version, 3.0.2. Props iamtakashi, closes #25812.
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`WP_UnitTestCase::go_to()` tried its best to clean up global space, but ultimately fell short. Because it was blowing away `WP` every time it was called, it was dropping all the query vars that were registered for custom taxonomies and custom post types (ouch).

Introduces `_cleanup_query_vars()`. This is a prerequisite for the unit tests on #20767. All unit tests pass with this change.

See #20767.
Fixes #25818.


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Category and tag are typically checked before checking for a custom taxonomy. If the global query matches category or tag (even if it also has tax_query set), return category/tag as the queried object, instead of arbitrarily returning the first term in the `tax_query` stack (typically those added with 'pre_get_posts').

Real world example: http://www.emusic.com/17dots/topics/daily-download/ - "tag" page, regionalized for US-only content using `pre_get_posts` passing in the terms "US" and "ALL" for "region" (custom tax). All of the theme functions would output "ALL" as the term name. Even though it was a tag archive, the queried object was an arbitrary term from `tax_query`.

See [26006]. All unit tests pass.
Fixes #20767.



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When WordPress is loaded in a function (e.g. unit tests) the variables initialized at the top level aren't globals, but we expect them to be. Explicitly make the version variables global.

Props nbachiyski.
Fixes #23685.


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Don't globalize version variables twice. See #23685.


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Cast proper fields to `int` when returning from `wp_get_object_terms()`. Add `term_taxonomy_id` and `object_id` to the list in `sanitize_term()` and `sanitize_term_field()`.  

Fixes #17646. Adds unit tests.
Props simonwheatley, dd32, kovshenin.


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Pass `$args` to the `export_wp` action in `export_wp()`, which is currently passed no arguments.

Props nickdaugherty.
Fixes #25574.


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Respect `paged` when `offset` is used in `WP_Query`. Adds unit tests.

Props coffee2code.
Fixes #18897.


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Add a filter to the Background Updates debug email, matches the filter used on the non-debug post-update emails. Props pento. Fixes #25756

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When checking filesystem permissions for core updates, only check the permissions of the files which we need to alter. Props nacin for initial patch. Fixes #25771 for trunk

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Remove dead code from the Plugin Upgrader class. Props jdgrimes. Fixes #25470

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Core Upgrader success statistics: Pass the version of WordPress we're upgrading from, as well as the version being upgraded to. Props nacin. See #25772 for trunk

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Core Upgrader: Include an unmodified $wp_version in Core_Upgrader::upgrade(). This protects against cases where the global $wp_version has been modified. See #25772

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