Instagram oEmbeds with Emoji only content break embeds

[Ipstenu]

This is not actually WordPress but I'm not sure how we would go about telling Instagram their embed is broken.

Reproduce:

Insert an Instagram link that has emojii like ​http://instagram.com/p/tnZ6DfBjly/

This generates the following invalid HTML:

<p><a href="http://instagram.com/p/tnZ6DfBjly/"><img src="”http://scontent-a-lax.cdninstagram.com/hphotos-xaf1/t51.2885-15/10683883_355903761240624_2147231606_a.jpg”" alt="”</p">
	</a></p>

Clearly they're not sanitizing something right. I filed a bug report with Instagram (linking them back to this) and it's pretty obvious this isn't us. We're just calling their code, right? Maybe we can use wordpress.org power to push this like we did with TED?

[SergeyBiryukov]

There's nothing wrong with the ​code returned by Instagram:

{"provider_url":"http:\/\/instagram.com\/","media_id":"821739397652560242_201355397","title":"\ud83d\udc40\ud83d\udc40\ud83d\udc40","url":"http:\/\/photos-a.ak.instagram.com\/hphotos-ak-xaf1\/10683883_355903761240624_2147231606_n.jpg","author_name":"snookinic","height":640,"width":640,"version":"1.0","author_url":"http:\/\/instagram.com\/snookinic","author_id":201355397,"type":"photo","provider_name":"Instagram"}

The issue is that the output stops at the alt attribute, leaving an unclosed quote:

<a href="http://instagram.com/p/tnZ6DfBjly/"><img src="http://photos-a.ak.instagram.com/hphotos-ak-xaf1/10683883_355903761240624_2147231606_a.jpg" alt="

And the end result gets mangled by wptexturize():

<a href="http://instagram.com/p/tnZ6DfBjly/"><img src=&#187;http://photos-a.ak.instagram.com/hphotos-ak-xaf1/10683883_355903761240624_2147231606_a.jpg&#187; alt=&#187;

It's the same issue as in #27961. The workaround suggested there works here too.

Closing as a duplicate of #21212, for the same reason as in #27961.