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pointer-gestures: add hold gestures

Peter Hutterer requested to merge whot/wayland-protocols:wip/hold-gestures into main

Hold gestures merely denote "there are fingers on the touchpad but they are not moving". As touchpad touches are generally fully abstracted, a client cannot currently know when a user is interacting with the touchpad without moving - no motion events will be sent in this case.

The two use-cases here are:

  • hold-to-interact: where a hold gesture is active for some time a menu could pop up, or some object is selected, etc.
  • hold-to-cancel: where e.g. kinetic scrolling is currently active, the start of a hold gesture can be used to stop the scroll

Since hold gestures by definition do not have movement, there is no need for an "update" stage in the gesture.

Minimum todo list:

cc @JoseExposito



Edited by Simon Ser

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