xf86-input-evdev: Changes to 'master'

[Peter Hutterer]

 man/evdev.man  |   13 +++++++++++++
 src/emuWheel.c |   13 +++----------
 src/evdev.c    |   17 ++++++++++++++---
 3 files changed, 30 insertions(+), 13 deletions(-)

New commits:
commit 7b0a65d989117d1b071101221ff1b97c1b4d1946
Author: Peter Hutterer <peter.hutterer at who-t.net>
Date:   Fri Jan 15 14:01:02 2016 +1000

    Don't reset the other axis on wheel emulation scroll buildup
    
    The idea was that of a direction lock: as we move vertically we should not
    build up any horizontal scroll motion even if we move slightly diagonally.
    
    The effect was though that the axis would be reset completely as soon as an
    event from the other axis occured. With the default threshold of 10, if one in
    ten events was a REL_X, we'd never get a wheel event.
    
    Drop this code, it's not needed. By default wheel emulation doesn't do
    horizontal scrolling, if a config snippet sets XAxisMapping the user wants
    horizontal scrolling. And since we just add the value anyway, as long as the
    user does a roughly vertical motion we won't get over the threshold anyway.
    
    https://bugs.freedesktop.org/show_bug.cgi?id=93617
    
    Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>

commit d24431a1863c49aa9edcabf535ffa64bfa87053c
Author: Peter Hutterer <peter.hutterer at who-t.net>
Date:   Thu Jan 14 10:41:46 2016 +1000

    Restore wheel emulation for absolute devices
    
    Wheel emulation relies on oldVals, which stopped updating in 3dcf6f123c5.
    
    Since wheel emulation may filter the abs event, store the event before we do
    anything with it. If we really want the abs_event, abs_queued will be set to
    1, otherwise the value will be ignored.
    
    And now that we know abs_value is always valied, we can copy its value into
    old_vals, so that wheel emulation can calculate the delta correctly.
    
    https://bugs.freedesktop.org/show_bug.cgi?id=93617
    
    Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>

commit ce7d8fdebc0123227be91ba5d89126a36f089ff5
Author: Peter Hutterer <peter.hutterer at who-t.net>
Date:   Thu Jan 14 11:18:56 2016 +1000

    man: add a warning that wheel emu inertia must be set and it isn't inertia
    
    First, it's not actually inertia, it's simply the scroll distance, yay for the
    misnomer.
    
    And it needs to be set for any device that is more fine-grained than a
    mouse, especially absolute devices. For example the VirtualBox device has an
    abs max of 32767, so a simple motion may have a delta of to 2000 units and
    that results in 200 scroll events. That's a bit excessive.
    
    Related to: https://bugs.freedesktop.org/show_bug.cgi?id=93617
    
    Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>