Media modal: preview images

[iseulde]

I'm not sure if this has been talked about before, but with FileReader we could preview images in the media modal.
​https://developer.mozilla.org/en-US/docs/Web/API/FileReader

I've made a quick patch to try it, but it's far from perfect... It sometimes flickers and the reading seems to block js from executing further, so not ideal for uploading a ton of images at the same time. Still, I'm sure we can get this to work smoothly somehow.

I'll attach a screenshot. I think this would be a really cool experience. :)

[helen]

So cool.

[chriscct7]

FileReader still has limited support ​http://caniuse.com/#feat=fileapi. However there's an MIT licensed plugin that could be used to bridge that gap ​https://github.com/MrSwitch/dropfile with a downside that it requires SilverLight