* Eliminate Media control template from having dependency on `params.settings.default` for element ID, to fix compat with `params.settings` array or single `params.setting`. See #36167.
* Move description out of label and add `aria-describedby` to Media control's Select button. See #30738, #33085.
* Obtain notification container whenever content is (re-)rendered (such as for Media control). See #38794.
* Re-render notifications after control content is re-rendered, if control is in expanded section. See #38794.
Amends [41390].
See #36167, #38794, #33085, #30738.
git-svn-id: https://develop.svn.wordpress.org/trunk@42031 602fd350-edb4-49c9-b593-d223f7449a82
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