Eat scroll event if a key binding function is executed because of it.

When an axis (scroll) event results in a key binding function
being executed, eat the scroll event so the underlying window
doesn't receive it.
Thanks to Scott Moreau for helping me solve this.

src/bindings.c

@@ -250,7 +250,7 @@ weston_compositor_run_button_binding(struct weston_compositor *compositor,
 	}
 }
 
-WL_EXPORT void
+WL_EXPORT int
 weston_compositor_run_axis_binding(struct weston_compositor *compositor,
 				   struct weston_seat *seat,
 				   uint32_t time, uint32_t axis,
@@ -262,8 +262,11 @@ weston_compositor_run_axis_binding(struct weston_compositor *compositor,
 		if (b->axis == axis && b->modifier == seat->modifier_state) {
 			weston_axis_binding_handler_t handler = b->handler;
 			handler(&seat->seat, time, axis, value, b->data);
+			return 1;
 		}
 	}
+
+	return 0;
 }
 
 WL_EXPORT int

src/compositor.c

@@ -1859,10 +1859,11 @@ notify_axis(struct weston_seat *seat, uint32_t time, uint32_t axis,
 
 	weston_compositor_wake(compositor);
 
-	if (value)
-		weston_compositor_run_axis_binding(compositor, seat,
-						   time, axis, value);
-	else
+	if (!value)
+		return;
+
+	if (weston_compositor_run_axis_binding(compositor, seat,
+						   time, axis, value))
 		return;
 
 	if (pointer->focus_resource)

src/compositor.h

@@ -656,7 +656,7 @@ weston_compositor_run_button_binding(struct weston_compositor *compositor,
 				     struct weston_seat *seat, uint32_t time,
 				     uint32_t button,
 				     enum wl_pointer_button_state value);
-void
+int
 weston_compositor_run_axis_binding(struct weston_compositor *compositor,
 				   struct weston_seat *seat, uint32_t time,
 				   uint32_t axis, int32_t value);