[gtk+] Do not filter out small scroll event fractions

[William Hua <williamhua src gnome org>]

commit fe216b0039bb4344d715421245327ce3547c0a08
Author: Andreas Pokorny <andreas pokorny canonical com>
Date:   Sun Aug 14 01:29:35 2016 +0200

    Do not filter out small scroll event fractions
    
    The scroll motion values are subject of batching and scaling. Either
    through scaling or by using a touchpad smooth scroll motion changes
    below 0.5 are possible.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769554
    
    Signed-off-by: Andreas Pokorny <andreas pokorny canonical com>

 gdk/mir/gdkmireventsource.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk/mir/gdkmireventsource.c b/gdk/mir/gdkmireventsource.c
index b363062..8c7e106 100644
--- a/gdk/mir/gdkmireventsource.c
+++ b/gdk/mir/gdkmireventsource.c
@@ -196,7 +196,7 @@ generate_scroll_event (GdkWindow *window, gdouble x, gdouble y, gdouble delta_x,
   else
     {
       event->scroll.direction = GDK_SCROLL_SMOOTH;
-      event->scroll.delta_x = -delta_x;
+      event->scroll.delta_x = delta_x;
       event->scroll.delta_y = -delta_y;
     }
 
@@ -403,7 +403,7 @@ handle_motion_event (GdkWindow *window, const MirInputEvent *event)
           hscroll = mir_pointer_event_axis_value (pointer_event, mir_pointer_axis_hscroll);
           vscroll = mir_pointer_event_axis_value (pointer_event, mir_pointer_axis_vscroll);
 
-          if (ABS (hscroll) > 0.5 || ABS (vscroll) > 0.5)
+          if (hscroll != 0.0 || vscroll != 0.0)
             generate_scroll_event (window, x, y, hscroll, vscroll, modifier_state, event_time);
           if (ABS (new_x - x) > 0.5 || ABS (new_y - y) > 0.5)
             {