And not just internal to gdk, so we can use it in gtk as well, to
differentiate emulated scroll events from others.
https://bugzilla.gnome.org/show_bug.cgi?id=765939
void _gdk_event_set_pointer_emulated (GdkEvent *event,
gboolean emulated);
-gboolean _gdk_event_get_pointer_emulated (GdkEvent *event);
void _gdk_event_set_scancode (GdkEvent *event,
guint16 scancode);
void gdk_synthesize_window_state (GdkWindow *window,
GdkWindowState unset_flags,
GdkWindowState set_flags);
+GDK_AVAILABLE_IN_3_22
+gboolean _gdk_event_get_pointer_emulated (GdkEvent *event);
G_END_DECLS