Pass the requested size to 'wp_get_attachment_image_attributes' filter.

props mattheu.
fixes #29869.
Built from https://develop.svn.wordpress.org/trunk@29836


git-svn-id: http://core.svn.wordpress.org/trunk@29600 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update @param docs for wp_get_attachment_image().

see #29869.
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git-svn-id: http://core.svn.wordpress.org/trunk@29601 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix misleading documentation in customize-loader.js.

props ericlewis.
fixes #29866.
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git-svn-id: http://core.svn.wordpress.org/trunk@29602 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Network Admin: Properly check if the theme is active on the main site to avoid deleting it via bulk actions.

props ocean90.
fixes #29861.
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git-svn-id: http://core.svn.wordpress.org/trunk@29603 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Translate some previously untranslated _doing_it_wrong() messages.

props georgestephanis.
fixes #25614.
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git-svn-id: http://core.svn.wordpress.org/trunk@29604 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add default z-index to the admin menu, see #29806
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git-svn-id: http://core.svn.wordpress.org/trunk@29605 1a063a9b-81f0-0310-95a4-ce76da25c4cd