c_gtk_drag_set_icon_pixbuf

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GdkDragContext* context, GdkPixbuf* pixbuf, int hotX, int hotY) c_gtk_drag_set_icon_pixbuf;

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