woodenbrick/gtkPopupNotify — pull request #4 by ntfwc (2014-04-11 00:06:55+00:00)
Title: Bug Fix: Taskbar not properly avoided, especially with multiple pop-ups

Using the library for a project, I noticed that pop-ups were not properly avoiding the taskbar. And when multiple pop-ups were shown at once, they were separated by an increasing multiple of the taskbar size. This distance was maintained after closing a pop-up below.
This edit should fix the issue.