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Backports for 1995-05-29T20:16:10Z!kwzh@gnu.org, 1995-05-03T21:38:13Z!rms@gnu.org and 1995-05-31T19:46:12Z!kwzh@gnu.org.

* nsmenu.m (ns_update_menubar): Add braces to ambigous if-else.

* nsmenu.m (Popdown_data): New struct.
(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).

* nsterm.m (keyDown:): Interpret flags without left/right bits
as the left key (Bug#1995-05-03T21:38:13Z!rms@gnu.org).

* nsterm.m (ns_read_socket): Return early if there is a modal
window (Bug#1995-05-31T19:46:12Z!kwzh@gnu.org).