When we bring a generic pen (serial 0) into proximity, the tool is initialized
as "generic" and mapped to the current tablet. This is then written out into
the keyfile, so we end up with something like:
[056a:00d1]
Styli=generic;
On the next g-c-c start the generic pen is pre-loaded from the keyfile but not
yet associated with the tablet. When the pen gets into proximity the
association was handled like a completely new pen, thus triggering a key file
entry again. Eventually, our styli list looked like this:
[056a:00d1]
Styli=generic;generic;generic;generic;generic;generic;
Fix this by remembering whether we freshly initialized the tool or whether it
was already known. Since we can only have one generic tool per tablet (because
we wouldn't notice the difference between two physical tools) we just skip the
write of the keyfile.
Fixes#313
In the wayland tablet input model, compositor and clients may
recognize the different physical styli in use, even if those are
used across compatible tablets.
This object is intended to be used as a persistent memory of
which stylus was used with which tablet. So you 1) can associate
tools and devices when such combination happens, and 2) query the
styli that were previously used with a tablet when it is detected/
plugged.
These associations are stored in two keyfiles in
~/.cache/gnome-control-center/wacom/, one for tablets and other
for styli.
