[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

GitLab Migration User  changed:

   What|Removed |Added

 Resolution|--- |MOVED
 Status|REOPENED|RESOLVED

--- Comment #15 from GitLab Migration User  ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/libinput/libinput/issues/5.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #14 from Nate Graham  ---
I think there's a pretty trivial way to resolve this: consider 70px or so strip
on the bottom to be where a thumb will land, and completely disregard any
touches on that strip while the pointer is moving. Basically, bring the bottom
strip from Areas into Clickfinger, but only for the purpose of disregarding
thumb activity.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #12 from Nate Graham  ---
The visible benefit is that people can lazily rest their thumb on the bobottom
part of the touchpad, which is a very natural way to use it. If it has physical
buttons, you rest your thumb on one of them. If it doesn't, you rest your thumb
on the bottom part of the pad as if it had them.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #11 from Peter Hutterer  ---
fwiw, this behaviour is what macos appears to have but I don't know how hard
this would be to integrate into libinput. we'd likely have to figure out the
exact behaviour we want too. It's a lot easier to argue that fingers shouldn't
move when you have software buttons but that argument is harder with
clickfinger because you're taking parts of the touchpad away without any
visible benefit.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #10 from Nate Graham  ---
Put another way: I would use the Areas method instead if I could turn off the
virtual middle and right buttons and use fingers for right and middle click.
Some hybrid between the two would be ideal. I want both a bottom exclusion zone
and also the ability to two-finger right-click.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #9 from Nate Graham  ---
One thing that would help is if the clickfinger method shared the exclusion
area at the bottom of the pad that the areas method has. Basically, if there
are one or more fingers generating events anywhere above the exclusion zone,
just ignore any events inside the exclusion zone.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #8 from Peter Hutterer  ---
the current algorithm works: if we have a finger that exceeds the motion
threshold for more than 5 events in a row, a new touch will be marked as thumb
and ignored. In your recording, the new touch happens at the fourth event, i.e.
another 2 events (~25ms later) and the thumb detection would've kicked in.

fixing this is nontrivial because we just don't have enough data and there are
many conflicting use-cases (responsive scrolling vs palm detection vs pinch
gestures vs thumb detection). Right now, I don't have a good idea on how to fix
this beyond "don't drop your thumb on a touchpad if the touchpad isn't capable
of detection thumbs". Which is the case here because all we have is pressure
and the thumb has the same pressure levels as your moving finger.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #7 from Nate Graham  ---
Created attachment 135511
  --> https://bugs.freedesktop.org/attachment.cgi?id=135511=edit
evemu record with git master and kernel 4.13.0

Correction: I was mistakenly using areas mode when I tested; clickfinger mode
still has this issue, I'm afraid, as of tonight's git master and kernel 4.13.0.
evemu recording attached.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

Nate Graham  changed:

   What|Removed |Added

 Status|RESOLVED|REOPENED
 Resolution|FIXED   |---

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #6 from Nate Graham  ---
Yup, I can confirm that this is fixed now. Thanks!

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268
Bug 99268 depends on bug 98799, which changed state.

Bug 98799 Summary: "Clickfinger" behavior interferes with normal operation when 
a thumb is resting on the bottom of the touchpad
https://bugs.freedesktop.org/show_bug.cgi?id=98799

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |MOVED

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268
Bug 99268 depends on bug 91097, which changed state.

Bug 91097 Summary: Pointer sometimes moves before hard click on trackpad
https://bugs.freedesktop.org/show_bug.cgi?id=91097

   What|Removed |Added

 Status|NEEDINFO|RESOLVED
 Resolution|--- |INVALID

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

Peter Hutterer  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|NEW |RESOLVED

--- Comment #5 from Peter Hutterer  ---
Closing this because based on comment 0 bug 99703 should fix this issue. There
may be more to do, but let's see how we go for now.

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268
Bug 99268 depends on bug 99703, which changed state.

Bug 99703 Summary: Trackpad accidental two-finger touch stops cursor movement 
too early
https://bugs.freedesktop.org/show_bug.cgi?id=99703

   What|Removed |Added

 Status|NEEDINFO|RESOLVED
 Resolution|--- |FIXED

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

Peter Hutterer  changed:

   What|Removed |Added

 Depends on||99703


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=99703
[Bug 99703] Trackpad accidental two-finger touch stops cursor movement too
early
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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

--- Comment #3 from Nate Graham  ---
I think the solution here is to adopt the "dead zone" bottom area that the
"areas" behavior already uses. Don't put any virtual buttons there; just
discard any input when a second, third, or fourth touch appears in that zone.
This seems to be what Apple does on their laptops (23-year Apple user here,
recently switched to PC + Linux).

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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

Peter Hutterer  changed:

   What|Removed |Added

 Depends on||98799, 91097

--- Comment #2 from Peter Hutterer  ---
Attachment 128740 shows that the finger is eventually detected as thumb and
that stops the scrolling and switches back to pointer motion. This is likely
due to the THUMB_MOVE_TIMEOUT triggered in tp_thumb_detect().

But basically the same issue as bugs 98799 and 91097. We need an area in
clickfinger mode where we ignore some pointer motion. Feel free to come up with
ideas or patches on how to implement this best :)


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=91097
[Bug 91097] Pointer sometimes moves before hard click on trackpad
https://bugs.freedesktop.org/show_bug.cgi?id=98799
[Bug 98799] "Clickfinger" behavior interferes with normal operation when a
thumb is resting on the bottom of the touchpad
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[Wayland-bugs] [Bug 99268] With Clickfinger behavior, pointer movement briefly turns into a scroll when a thumb is dropped onto the pad

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=99268

Nate Graham  changed:

   What|Removed |Added

Summary|Clickfinger behavior|With Clickfinger behavior,
   ||pointer movement briefly
   ||turns into a scroll when a
   ||thumb is dropped onto the
   ||pad

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