r14123 breaks TB window on plugin/theme installers

[demetris]

I’m seeing this on two different setups, with both browsers I tried, Firefox and Opera:

The ThickBox has now an horizontal scrollbar, and you need to scroll to to the right to see all content, in order, e.g., to click the Install link.

Guilty revision: r14123

Sry, my mistake. Class wp-admin has a min-width of 785px. I also have removed the folded class because we didn't need it in the iframe.

I think the admin_body_class filter shouldn't be there too. This is not the "admin body". If we need to give access to plugins to add CSS classes there perhaps can add guu-iframe-body-class or similar, although don't think that's needed.

(In [14210]) Remove Horizontal scrollbars on Thickbox iframes. Props ocean90. Fixes #13062

I removed the admin_body_class filter as well. Didnt see a point in adding anything in its place.