Issue #3472900 by boulaffasae, kristen pol: XBEndpointRenderer &...

Issue #3472900 by boulaffasae, kristen pol: XBEndpointRenderer & processResponseAssets() do not support ajaxPageState ⇒ duplicate CSS/JS loading

Closes #3472900

added 2 commits

• beeb342d - Revert "Issue #3472900 by boulaffasae, kristen pol: XBEndpointRenderer &...
• a6e4409d - Add test for opening the media widget twice.

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added 2 commits

• 45beb7f9 - Check validity of form elements before updating the model.
• af3d7016 - Fix validity check for non-input form elements.

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Closing in favor of !314 (merged).

closed