Don't blow up small thumbnails

[nacin]

Here's a favicon forced to be many more pixels wide than it should be: ​http://cl.ly/image/460U083s343M. Same thing happens with small images (not just .ico files). I imagine this is a fairly straightforward CSS change.

[pavelevap]

Yes, I noticed the same problem before: ​http://core.trac.wordpress.org/ticket/22518#comment:2

But I forget to promote it...

[helenyhou]

22681.diff​ seems to work - tested Firefox and Chrome on OSX and IE7 and IE8 in XP on Browserstack. IE doesn't center the images - probably because of the transform used. I don't think it's a wrecky experience for those browsers, but can look at doing more with it if so desired.

[nacin]

Solid to me.

[koopersmith]

In 22978:

Prevent small thumbnails from being upscaled. props helenyhou. fixes #22681.