GPX-Viewer GTK3 edition
With the help of Andrew H. I managed today to port GPX-Viewer to GTK3 and libchamplain 0.12. Not everything is working yet, but the basic functionality is back.
The biggest missing thing is that the ChamplainView does not seem to accept mouse presses. So you can not pan/move the view.. (weird). Help with this is very welcome.
You can find the code here.