fill-paragraph eats second space after curly quotes at end of sentence

[Leandro Guimaraens Faria Corcete Dutra]

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In GNU Emacs 21.3.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2004-04-06 on raven, modified by Debian
configured using `configure '--build=i386-linux' '--host=i386-linux' 
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' 
'--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' '--with-x=yes' 
'--with-x-toolkit=athena' 'CFLAGS=-DDEBIAN -g -O2' 'build_alias=i386-linux' 
'host_alias=i386-linux''
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: pt_BR.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

        While editing Unicode text, fill-paragraph eats the second
space after curly single or double quotes at the end of sentence.

        For example:

summed up by his expression that every man ought to be allowed to own
=d0c8three acres and a cow.=d0c9  Though not know as a political thinker, his
political influence has circled the world.  Some see in him the father of


became:

summed up by his expression that every man ought to be allowed to own 
=d0c8three acres and a cow.=d0c9 Though not know as a political thinker, his
political influence has circled the world.  Some see in him the father
of


        Notice too that the line before the one beginning in curly
quotes got a trailing space.



Recent input:
C-y <up> <up> <up> C-SPC <down> <down> <right> <right> 
<right> <right> <up> M-q M-f M-f M-f M-f M-f M-f M-b 
<left> <left> M-x r e p <tab> o <tab> t <tab> <backspace> 
r <tab> b u <tab> <return>

Recent messages:
Omitted 3 lines.
Invalid face text property value: face [2 times]
Reading directory /home/ldutra/usr/src/B=8edblias/Heretics/...done
Omitting...
Omitted 2 lines.
Invalid face text property value: face [2 times]
Type C-h for help, h for commands, q to quit.
Invalid face text property value: face [4 times]
Mark set [3 times]
Making completion list... [2 times]