[gtk+/gtk-3-8] gdk: Ignore crossings generated by passive grabs when resetting scroll axes

[Carlos Garnacho <carlosg src gnome org>]

commit 81b7c4e40b11df3cb423e868e202884062babb50
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Nov 18 22:12:18 2013 +0100

    gdk: Ignore crossings generated by passive grabs when resetting scroll axes
    
    Passive grabs may take pointer focus out of the application, even though
    the pointer didn't leave the window, but those events still trigger resetting
    of the scroll axes. This is most visible with compiz, and possibly other
    reparenting WMs, where passive grabs happen on the WM-managed window that
    is a parent of the application toplevel.
    
    As it is not possible to have scrolling happening on the timespan a passive
    grab takes action, it is entirely safe for GTK+ to assume none happened if
    it gets a crossing event of that nature.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=699574#c33

 gdk/x11/gdkdevicemanager-xi2.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gdk/x11/gdkdevicemanager-xi2.c b/gdk/x11/gdkdevicemanager-xi2.c
index 6062f6a..2683a46 100644
--- a/gdk/x11/gdkdevicemanager-xi2.c
+++ b/gdk/x11/gdkdevicemanager-xi2.c
@@ -1558,7 +1558,8 @@ gdk_x11_device_manager_xi2_translate_event (GdkEventTranslator *translator,
                                              GUINT_TO_POINTER (xev->sourceid));
         gdk_event_set_source_device (event, source_device);
 
-        if (ev->evtype == XI_Enter && xev->detail != XINotifyInferior &&
+        if (ev->evtype == XI_Enter &&
+            xev->detail != XINotifyInferior && xev->mode != XINotifyPassiveUngrab &&
            gdk_window_get_window_type (window) == GDK_WINDOW_TOPLEVEL)
           {
             if (gdk_device_get_device_type (source_device) != GDK_DEVICE_TYPE_MASTER)