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touchpad: on a non-clickpad, reset the motion history on nfingers change

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The only reason to have more than one finger on a non-clickpad is to tap,
scroll or gesture. In all cases resetting the motion history is a good idea to
avoid jumps moving from 2 to 1 finger.

https://bugs.freedesktop.org/show_bug.cgi?id=97194

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 3cb60130c1)
This commit is contained in:
Peter Hutterer 2016-08-04 15:23:43 +10:00
parent 865fc1fa65
commit cb7cef6f4b
1 changed files with 5 additions and 2 deletions
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7
src/evdev-mt-touchpad.c
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@ -955,8 +955,11 @@ tp_need_motion_history_reset(struct tp_dispatch *tp)
{
bool rc = false;
/* semi-mt finger postions may "jump" when nfingers changes */
if (tp->semi_mt && tp->nfingers_down != tp->old_nfingers_down)
/* Semi-mt finger postions may "jump" when nfingers changes. And on
* a non-clickpad the only reason to have more than one finger down
* is scrolling/gesture, so a reset just makes things sane again */
if ((tp->semi_mt || !tp->buttons.is_clickpad) &&
tp->nfingers_down != tp->old_nfingers_down)
return true;
/* if we're transitioning between slots and fake touches in either