The wacom panel expects all tablet devices to have the "tablet"
device type flag set on the GsdDevice, otherwise devices won't get
recognized and paired with the other devices for the same tablet.
Uncovered now that GTK+ correctly uses GDK_SOURCE_TABLET_PAD for
pad devices on X11.
https://bugzilla.gnome.org/show_bug.cgi?id=784882
With gtk+ >= 3.22 trackpoints are classified separately from mice so
we need to handle them here. Also, remove the default case so that we
get a compilation warning in case this happens again.
In the future we might want to expose this further if we start adding
trackpoint specific UI.
https://bugzilla.gnome.org/show_bug.cgi?id=776660
GsdWacomDevice has been updated, dragging GsdDeviceManager as a dependency
from g-s-d, which has been added to panels/common, and compiled as a
separate static libary, which is used by the wacom and mouse modules.
gsd-input-helper.[ch] is now in such library and has been removed from
the panel directories.
https://bugzilla.gnome.org/show_bug.cgi?id=743196
