Pencil does not consider changing link of an element as a change

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Save your document
2. Change link of a document
3. Pencil does not notify me that the document has changed (No * in the title)

What is the expected output? What do you see instead?
I expect Pencil to display this star because I changed the file

What version of the product are you using? On what operating system?
Pencil 1.3.4 on Windows 7 Pro (bundled)
Not sure that my title is clear enough, feel free to change it.

Thanks for your awesome application !

Original issue reported on code.google.com by baptist...@gmail.com on 21 Feb 2012 at 10:49