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(pop_down_menu): p->pointer is Popdown_data.  Release the pool and
free Popdown_data.
(ns_popup_dialog): Use NSAutoreleasePool and pass it to pop_down_menu.
(initWithContentRect): Make imgView and contentView non-static
and autorelease them.  Also autorelease img and matrix.
(dealloc): Remove (Bug#1995-05-29T20:16:10Z!kwzh@gnu.org).