Adam Silverstein 5cc6c39430 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.

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git-svn-id: http://core.svn.wordpress.org/trunk@40681 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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