Twenty Fourteen: add documentation for global variables used in `twentyfourteen_wp_title()`. Closes #28421.
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Twenty Thirteen: fix layout issue with search form in older versions of Safari and Android. Fixes #24192, props iljoja.
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Twenty Fourteen: apply `.widget` input and textarea styles only if they are inside `.widget-area`. Props jesin, fixes #27677.
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After [28613], also kill queries that explicityly pass empty arrays to `category__in`, `tag__in`, `tag_slug__in`, and `author__in` to `WP_Query`.

Adds unit tests.
Fixes #28099.

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Wrap individual meta query `WHERE` clases in parens, missed in `28659`.

Props boonebgorges.
Fixes #25538.


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