[Wayland-bugs] [Bug 103086] Detect pressure offset on proximity out as well

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103086

            Bug ID: 103086
           Summary: Detect pressure offset on proximity out as well
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: peter.hutterer at who-t.net

Created attachment 134653
  --> https://bugs.freedesktop.org/attachment.cgi?id=134653&action=edit
evemu recording from a pressure offset on proximity out

If the user taps too quickly on proximity in, the first event may have the real
pressure already, negating the pressure offset detection. On release, we drop
down to an almost-nil pressure offset and never release the tip (until out of
proximity).

It may be possible to detect this automatically by looking at the last pressure
value before the proximity out event and fixing things for the second proximity
in. Probably needs a lower threshold than the up to 20% we use on the way in,
and some sort of heuristic to average across several events before the
proximity out.

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