Adam Silverstein dbfd852fc2 Themes: enable browser history support in add new theme screen.
Enable history support for the new theme screen, including navigating theme details and closing the details modal. Theme selection is now also bookmark-able, so linking to a URL like `/wp-admin/theme-install.php?theme=twentyseventeen` correctly opens the theme preview.

Props dd32.
Fixes #36613.


git-svn-id: https://develop.svn.wordpress.org/trunk@40107 602fd350-edb4-49c9-b593-d223f7449a82
2017-02-24 17:47:30 +00:00
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243 MiB
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PHP 80.5%
CSS 9.4%
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SCSS 0.9%
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