Many part of this commit were made by Carlos
Garnacho <carlosg@gnome.org>
WIP wacom: Port to GTK4
Lots of stuff missing and probably broken.
wacom: Port CcDrawingArea input to gestures
We have a handy GtkGestureStylus to use here, which avoids direct
handling of GdkEvents.
wacom: Update current stylus tracking to GtkGestureStylus
Use the ::proximity signal to notice when we are being hovered with
a tablet stylus, and look up the tool from there.
This can only be used for tablets that are not display nor system
integrated (eg. intuos models). The mapping of tablets with a builtin
display remain in g-s-d/GsdDeviceMapper.
This is a vast oversimplification of GsdWacomDevice. This one
has code that is largely unnecessary here (mostly devised for g-s-d),
plus it will be even eventually removed from g-s-d (the functionality
is moving into compositor domain), so the code sharing argument
remains pretty weak.
So, CcWacomDevice is thought to take over, just offering the basic
API we after all need in the gnome-control-center side.
