Can't scroll in FF after switching tabs on libinput platform

[wmww]

After opening Firefox scrolling works fine on the first tab, but stops working after the first tab switch until it's restarted. Wayland messages Mir is sending seem normal, but this doesn't effect Sway so there must be something different we're doing.

[wmww]

Updates:

• This is present at least as far back as v2.5
• It happens on libinput/KMS, but not the X11 platform

[AlanGriffiths]

I see this, but only with touchpad scrolling. (Scrolling with mouse wheel works as expected).

[wmww]

The problem is that we do not send wl_pointer.axis_stop events for axis sources wl_pointer::axis_source::finger, as required by the protocol.

wayland.xml:

If the source is wl_pointer.axis_source.finger, a wl_pointer.axis_stop event will be sent when the user lifts the finger off the device