[Bug 48090] Buttons render "dirty"

[jag]

Public bug reported:

Using the "Human" theme, buttons in GTK render with random pixels of
color overlayed on them. See attached screenshot.

-jag

** Affects: gtk+2.0 (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

** Attachment added: "Example"
   http://librarian.launchpad.net/3008815/Screenshot-Compose%20Message.png

-- 
Buttons render "dirty"
https://launchpad.net/bugs/48090