[mutter] wayland: Update button state on motion/button events

[Carlos Garnacho <carlosg src gnome org>]

commit 5db48faca408582706fbe07b570f64a879a515a7
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Jul 24 17:29:37 2017 +0200

    wayland: Update button state on motion/button events
    
    More specifically, avoid crossing events, since clutter does not set
    modifier/button state on those. Fixes implicit grabs being broken when
    the pointer moves past the surface boundaries.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=785347

 src/wayland/meta-wayland-pointer.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/src/wayland/meta-wayland-pointer.c b/src/wayland/meta-wayland-pointer.c
index 15e27cd..d5c90c1 100644
--- a/src/wayland/meta-wayland-pointer.c
+++ b/src/wayland/meta-wayland-pointer.c
@@ -606,7 +606,12 @@ meta_wayland_pointer_update (MetaWaylandPointer *pointer,
 {
   repick_for_event (pointer, event);
 
-  pointer->button_count = count_buttons (event);
+  if (event->type == CLUTTER_MOTION ||
+      event->type == CLUTTER_BUTTON_PRESS ||
+      event->type == CLUTTER_BUTTON_RELEASE)
+    {
+      pointer->button_count = count_buttons (event);
+    }
 }
 
 static void