I needed to use gpx-viewer, so I decided to directly give it some updates:

• Install application/gpx+xml  mime type for *.gpx files.
  This however breaks make distcheck. (update-mime-database creates some directories, that are not gone on uninstall..  How do I work around this?)
• Update recentmanager to use this mime type for recent files.
• Call update-desktop-database on install/uninstall.
• Merge the GTK3 branch into master.
• Small cleanups.

There is one problem though, for some reason. GPX-Viewer does not get ‘seen’ as an application that can open application/gpx+xml files.  Even though I have it set in the .desktop file and I update the desktop database file.

So for GPX-Viewer 0.3 the following changes will be in:

• Port to GTK3
• Port to libchamplain 0.12
• Track now has height-colors.
• Tracks are clickable. clicking on atrack will highlight that point in the graph.
• Use GtkApplication instead of Unique.
• Stopped detection on tracks. (points detected as stopped are highlighted red.)
• Filter out points that are a linear continuation. (should make for less complex tracks, so improved performance)
• etc..