[inspect] fix panel rendering bug

This fixes this shitty shitty problem once and for all

(https://dl-web.dropbox.com/get/Screenshots/Screenshot%202014-12-11%2008.10.29.jpg?_subject_uid=30492614&w=AAC7nnKc_89HY6mf9mxH_KG3ZqhNCQ8bJSzpzF29pTCsBg

And in gif form:
https://www.dropbox.com/s/h0mvbck01j3z0bu/inspector-chrome-bug.gif


Here's a jsfiddle that reproduces it:
http://jsfiddle.net/b9ywgc6j/11/

Thanks @nerdpruitt and @ianstew

By the way, we were able to file a chromium bug that should help root out the underlying problem:
https://code.google.com/p/chromium/issues/detail?id=441542&thanks=441542&ts=1418341505