[Bug 1697122] Re: Package Firefox with MOZ_USE_XINPUT2=1 in environment to enable pixel scrolling with touchpad and touch gestures

[Nate Graham]

BTW I've since changed my mind on this. Setting the proposed environment
variable makes toupad scrolling mysteriously slow down after a
notification arrives until you switch focus away from Firefox and back
(See https://bugzilla.mozilla.org/show_bug.cgi?id=1182700). This problem
is particularly severe for mouse scroll wheel users, where wheel
scrolling breaks entirely until you switch away and back again.

I grudgingly live with the issue when I'm using a touchpad, but I unset
the envar when I'm using a mouse because of how bad it is.

I think https://bugzilla.mozilla.org/show_bug.cgi?id=1182700 needs to be
fixed upstream before this can be considered. Unfortunately, it's
blocked on a GTK issue (https://gitlab.gnome.org/GNOME/gtk/issues/558)
that the GTK developers have declared unfixable on X11.

** Bug watch added: gitlab.gnome.org/GNOME/gtk/issues #558
   https://gitlab.gnome.org/GNOME/gtk/issues/558

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Title:
  Package Firefox with MOZ_USE_XINPUT2=1 in environment to enable pixel
  scrolling with touchpad and touch gestures

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