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Tablet touch arbitration rectangle

Peter Hutterer requested to merge whot/libinput:wip/touch-arbitration-rect into master

cc @bentiss, @jigpu

This branch adds support for location-based touch arbitration for tablet devices. Instead of just disabling all of the touch device, we give it a rectangle to disable. Touches inside that rect are cancelled (on tip down) and new touches within that rect are ignored. The rect updates as the tip moves around.

The rect is 200x200mm, using the pen tilt as a hint which direction the hand is likely going to be.

Fixes #149 (closed)

Edited by Peter Hutterer

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