These are a construct only properties, expected to be filled in from platform specific code.
https://bugzilla.gnome.org/show_bug.cgi?id=740758
5e53676 device: Add property/getters for vendor/product identifiers
docs/reference/gdk/gdk3-sections.txt | 2 +
gdk/gdkdevice.c | 114 +++++++++++++++++++++++++++++++++-
gdk/gdkdevice.h | 5 ++
gdk/gdkdeviceprivate.h | 3 +
4 files changed, 123 insertions(+), 1 deletion(-)
Upstream: git.gnome.org