Add a focus outline to the widget control toggle arrows. Fixes #27953. Props TomHarrigan.
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Avoid double path separators in `load_theme_textdomain()`. Fixes #29122. Props bradyvercher
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Update the docs for `wp_remote_retrieve_response_code()`. See #28887.
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TinyMCE: update the default styles: make the font size larger and make it the same size in tables. Fixes #30038
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Twenty Fifteen: better editor-style.css: slightly smaller fonts, make the body margins relative, fix dependency on the `mce-item-table` class for tables. Props iamtakashi, fixes #29986
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Twenty Fifteen: Fix missing commas in the stylesheet.

props iamtakashi.
fixes #30068.
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Script-loader: remove 'heartbeat' dependency for post.js and inline-edit-post.js, fix dependencies for autosave.js. Fixes #30008
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