Warning
gdk_window_at_pointer has been deprecated since version 3.0 and should not be used in newly-written code. Use gdk_device_get_window_at_position() instead.
Obtains the window underneath the mouse pointer, returning the
location of that window in win_x, win_y. Returns NULL if the
window under the mouse pointer is not known to GDK (if the window
belongs to another application and a GdkWindow hasn't been created
for it with gdk_window_foreign_new())
NOTE: For multihead-aware widgets or applications use
gdk_display_get_window_at_pointer() instead.
Warning gdk_window_at_pointer has been deprecated since version 3.0 and should not be used in newly-written code. Use gdk_device_get_window_at_position() instead. Obtains the window underneath the mouse pointer, returning the location of that window in win_x, win_y. Returns NULL if the window under the mouse pointer is not known to GDK (if the window belongs to another application and a GdkWindow hasn't been created for it with gdk_window_foreign_new()) NOTE: For multihead-aware widgets or applications use gdk_display_get_window_at_pointer() instead.