Weston Ruter 0421a2b0a4 Widgets: Harden logic for checking for valid media URLs.
* Update deprecated `isHostedVideo` method to always return `true` since all oEmbeds are now supported.
* Disable `scanImage` for non-image media widgets.
* Ensure embed URL field element is matched from current media frame instance due to bug where media frames are not destroyed upon closing.
* Update error message for invalid video URLs to ask user to check the URL for validity.

Props gk.loveweb, octalmage, westonruter.
See #42039, #40935.
Fixes #41052.


git-svn-id: https://develop.svn.wordpress.org/trunk@41933 602fd350-edb4-49c9-b593-d223f7449a82
2017-10-19 00:06:25 +00:00
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