preview controller memoize response #989
Merged
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adjusted preview controller to clear its content on close, but at the same time also memoize the embed response from the server
the should help in dealing with e.g. youtube embed preview where simply hiding the preview container would not make it stop, and there's no good way to universally stop embed media players other than to erase them out entirely, while not making extra requests to the server when the preview is being repeatedly shown/hidden in the same page session