This allows clients to be aware of "natural scrolling" settings in the
compostior and adjust accordingly to optionally keep the same wheel and
trackpad behaviour accross platforms.
Testing using the "testmouse" example, behaviour in the demo is now the
same regardless of the compositor setting for scrolling.
Update the Wayland core protocol spec file and add support for the new axis_value120 event to handle high resolution scroll wheels.
The axis_value120 replaces the axis_discrete event, which is no longer sent as of version 8 of the protocol. Note that unlike the axis_discrete event, no mention in the spec is made regarding how many axis_value120 events may occur per-axis per-frame, so the values are accumulated and committed when the pointer frame event occurs.
Now you don't need the latest Wayland installed to build with
newer protocols supported, as they'll build correctly; even if
your system can't use them, we can make intelligent decisions
at runtime about what's available on the current machine anyhow.
This also simplifies some logic and possible failure cases in
the configure and CMake scripts.
Fixes Bugzilla #4207.
David Edmundson
Frank Praznik
Simon Zeni
Ryan C. Gordon