Adam Silverstein b83c9d4e7f Themes: improve browser history support on new themes page.
When closing the theme preview, restore the previously selected tab. Avoid an issue where duplicate entries in the history prevented navigation. When re-opening the preview, remove bound event handlers before re-adding them.

Props afercia.
Fixes #36613.


git-svn-id: https://develop.svn.wordpress.org/trunk@40824 602fd350-edb4-49c9-b593-d223f7449a82
2017-05-23 20:32:00 +00:00
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