Create a testcase for bug 236953 (gedit)

When using gedit to browse a mounted sftp location for a file to open, or when browsing the sftp location to save a file, gedit will crash when using the breadcrumb (history) buttons to navigate.

How to replicate:

1) Add a bookmark to an ssh location which contains a couple of layers of directories
2) Open gedit and choose "File>Open..."
3) Click on the new bookmark and navigate down a directory tree a couple of levels
4) Use the breadcrumb buttons to go back to the top level of the bookmark
5) If gedit hasn't already crashed just navigate back and forth a couple of times using the buttons, it invariably does.

This also happens on "Save" and "Save As.." which can lead to losing work.

Create a test case to track possible regressions.