(In reply to Alexander Browne from comment #7)
> > in gtk, kinetic scrolling stops after you put a finger on the touchpad 
> > (zwp_pointer_gesture_hold_v1 event), but in firefox it doesn't, you have to 
> > wait
> 
> In GTK 4, and Firefox uses GTK 3. So either someone need to add it to GTK 3 
> or Firefox needs to use to GTK 4.

Yeah. We have bug 1568722 open about this, and like you say it's blocked
on hold gestures being backported to GTK 3. It would be great if that
happened; as I mentioned in [this
comment](https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/3454#note_1427920),
we only need a backport of the GDK layer of hold gestures, not the whole
thing.

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https://bugs.launchpad.net/bugs/1922047

Title:
  Touchpad scrolling is too fast

Status in Mozilla Firefox:
  Confirmed
Status in GTK+:
  Fix Released
Status in Mutter:
  New
Status in firefox package in Ubuntu:
  Confirmed
Status in gtk+3.0 package in Ubuntu:
  Confirmed
Status in gtk4 package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  This is an issue which has troubled me for a while. Anecdotally,
  scrolling feels way too fast in GNOME on Wayland compared to on X11. I
  finally tested it semi-scientifically, and it seems like GNOME on
  Wayland scrolls almost exactly 1.5x faster than GNOME on X11.

  I tested this by testing how many lines are scrolled from a full two-
  finger touchpad swipe from the bottom of my touchpad to the top of my
  touchpad, and logged a few attempts in both X and Wayland. I kept
  track of the results in this spreadsheet:
  
https://docs.google.com/spreadsheets/d/17EaBM5Pgt7GdnnzcN2Vchk4kfT7IZ6i4qZ0zpVRGLhc/edit?usp=sharing

  I scrolled in one of my own GTK applications
  (https://github.com/mortie/lograt) because it lets me easily see how
  many lines I scrolled. Attach is a video of one full scroll on X11 and
  one full scroll on Wayland.

  This testing was performed on a Dell XPS 13 9343, but I've also used
  Ubuntu on a Dell XPS 9575 where GNOME Wayland scrolling also feels way
  too fast. I don't have other hardware to test on.

  This has been an issue on both Ubuntu 20.10 and Ubuntu 21.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: gnome-shell 3.38.4-1ubuntu1
  ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
  Uname: Linux 5.11.0-13-generic x86_64
  ApportVersion: 2.20.11-0ubuntu61
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar 31 11:44:04 2021
  DisplayManager: gdm3
  InstallationDate: Installed on 2019-11-21 (495 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  RelatedPackageVersions: mutter-common 3.38.4-1ubuntu1
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to hirsute on 2021-03-16 (14 days ago)

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