[gtk/wip/chergert/for-main] macos: actually drop unnecessary momentum events

[Christian Hergert <chergert src gnome org>]

commit 4ced1c90f168571ab3c2e422b77ec22569c079d3
Author: Christian Hergert <christian hergert me>
Date:   Thu Mar 10 03:21:12 2022 -0800

    macos: actually drop unnecessary momentum events
    
    These would get passed along to the NSApplication which we don't really
    need to have happen. Denote it as such.

 gdk/macos/gdkmacosdisplay-translate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/macos/gdkmacosdisplay-translate.c b/gdk/macos/gdkmacosdisplay-translate.c
index fe4701c39d..4ad12ba778 100644
--- a/gdk/macos/gdkmacosdisplay-translate.c
+++ b/gdk/macos/gdkmacosdisplay-translate.c
@@ -628,7 +628,7 @@ fill_scroll_event (GdkMacosDisplay *self,
    * handle those internally.
    */
   if (phase == 0 && momentumPhase != 0)
-    return NULL;
+    return GDK_MACOS_EVENT_DROP;
 
   seat = gdk_display_get_default_seat (GDK_DISPLAY (self));
   pointer = gdk_seat_get_pointer (seat);