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doc: fix reference to non-existent 'hold update' event in gestures.rst

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There is no LIBINPUT_EVENT_GESTURE_HOLD_UPDATE event in the API.
When a finger is detected as thumb/palm during a hold and other fingers
remain, the implementation cancels the current hold and starts a new one
with an updated finger count. Update the documentation to describe the
actual behavior.

Co-authored-by: Claude <noreply@anthropic.com>
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1469>
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Peter Hutterer 2026-04-17 11:58:05 +10:00 • committed by Marge Bot
parent fdd43a4fcd
commit 2400a5c128
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doc/user/gestures.rst
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@ -254,7 +254,8 @@ towards an interaction, see :ref:`thumb_detection` and
In the context of hold gestures, thumbs and palms are treated by libinput as
if the finger was removed from the device. Where other non-thumb/non-palm
fingers remain on the device, an **hold update** event is sent. Otherwise,
fingers remain on the device, the current hold gesture is cancelled and a
new **hold begin** event with the updated finger count is sent. Otherwise,
the hold gesture terminates with a **hold cancel** event.
Notably, libinput's thumb and palm detection is not a simple boolean per