bug#45582: 28: auto-fill final line of indented paragraph

[Boruch Baum]

Using the emacs-snapshot from ganneff.de (it's a few months old, but
there isn't a more recent. sigh. A more recent debian package for
stable/testing would be helpful for items on my todo list).

1) Start emacs -Q -nw
2) In the scratch buffer
3) M-x set-fill-column 10
4) Enable auto-fill-mode
5) Type two spaces
6) Type about twenty single character words

   At this point everything looks good; we have several indented lines of a
   paragraph.

7) Type return to end the paragraph

   I'm now getting the final line, that had prior been properly indented,
   now re-aligned / out-dented to column 1.

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