[gtk+] gdk: Make GDK_TOUCH_CANCEL be dealt with similarly to GDK_TOUCH_END

[Carlos Garnacho <carlosg src gnome org>]

commit 358d15ae5eabfa52b2dc3458e8ac59bec4d4e473
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Apr 17 21:19:58 2016 +0100

    gdk: Make GDK_TOUCH_CANCEL be dealt with similarly to GDK_TOUCH_END
    
    We must emit the cancel event with the same semantics, and towards the GdkWindow
    that is currently under the touchpoint, so make proxy_button_event() deal with
    GDK_TOUCH_CANCEL.
    
    Fixes the GDK_TOUCH_CANCEL event being emitted only on the toplevel, which is
    usually non-sufficient.

 gdk/gdkwindow.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 725b712..5db80fa 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -7697,6 +7697,7 @@ is_button_type (GdkEventType type)
         type == GDK_BUTTON_RELEASE ||
          type == GDK_TOUCH_BEGIN ||
          type == GDK_TOUCH_END ||
+         type == GDK_TOUCH_CANCEL ||
         type == GDK_SCROLL;
 }
 
@@ -9322,6 +9323,7 @@ proxy_button_event (GdkEvent *source_event,
 
     case GDK_TOUCH_BEGIN:
     case GDK_TOUCH_END:
+    case GDK_TOUCH_CANCEL:
       convert_toplevel_coords_to_window (event_win,
                                          toplevel_x, toplevel_y,
                                          &event->button.x, &event->button.y);
@@ -9337,7 +9339,7 @@ proxy_button_event (GdkEvent *source_event,
 
       gdk_event_set_source_device (event, source_device);
 
-      if ((type == GDK_TOUCH_END &&
+      if (((type == GDK_TOUCH_END || type == GDK_TOUCH_CANCEL) &&
            _gdk_event_get_pointer_emulated (source_event)) &&
            pointer_window == pointer_info->window_under_pointer &&
            gdk_device_get_source (source_device) == GDK_SOURCE_TOUCHSCREEN)