undoing from fill-paragraph

[Joshua Goldberg]

This bug report will be sent to the Free Software Foundation,
 not to your local site managers!!
Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 20.5.1 (sparc-sun-solaris2, Motif)
 of Wed Dec 15 1999 on mutt.cs.indiana.edu
configured using `configure  --prefix=/usr/local/gnu --with-x-toolkit=motif 
--with-gcc=no --x-includes=/usr/openwin/include --x-libraries=/usr/openwin/lib 
sparc-sun-solaris2'

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

Undoing from fill-paragraph doesn't seem to work right.  I give three
stages for illustration:


before experimental fill (M-q):

| First names ending in the vowel sound -à (which includes those spelled
| with -ÿ) are declined like all à-nouns. Note that some of these are
| men's names, some are women's names, and some are unisex, e.g.
| ѐøà. All are declined in the same way. 
|  
| First and last names ending in any other vowel are indeclinable. 
| These are usually non-Russian names.  (The same is true of place 
| names, names of inctitutions, etc.) 
|  
| Men's first names ending in a consonant are declined like all 
| #-declension nouns. 
|  
| Women's first names ending in a consonant are indeclinable: the 
| Nominative Singular form is used for all cases, singular and plural. 
|  
| Patronymics ending in -à are declined like all à-nouns. Patronymics 
| ending in a consonant are declined 
| like all #-declension nouns. 

after fill:

| First names ending in the vowel sound -à (which includes those
spelled | with -ÿ) are declined like all à-nouns. Note that some of
these are | men's names, some are women's names, and some are unisex,
e.g.  | ѐøà. All are declined in the same way.  | | First and last
names ending in any other vowel are indeclinable.  | These are usually
non-Russian names.  (The same is true of place | names, names of
inctitutions, etc.)  | | Men's first names ending in a consonant are
declined like all | #-declension nouns.  | | Women's first names
ending in a consonant are indeclinable: the | Nominative Singular form
is used for all cases, singular and plural.  | | Patronymics ending in
-à are declined like all à-nouns. Patronymics | ending in a consonant
are declined like all #-declension nouns.

after undo:

| First names ending in the vowel sound -à (which includes those spelled
| with -ÿ) are declined like all à-nouns. Note that some of these are
| men's names, some are women's names, and some are unisex, e.g.
| ѐøà. All are declined in the same way.  |   | First and last names ending in 
any other vowel are indeclinable.  | These are usually non-Russian names.  (The 
same is true of place  | names, names of inctitutions, etc.)  |   | Men's first 
names ending in a consonant are declined like all  | #-declension nouns.  |   | 
Women's first names ending in a consonant are indeclinable: the  | Nominative 
Singular form is used for all cases, singular and plural.  |   | Patronymics 
ending in -à are declined like all à-nouns. Patronymics  | ending in a 
consonant are declined like all #-declension nouns. 

 -Josh


===============================

These variables might be of interest:

/- Fill group: ----------------------------------------------------------\
      [State]: something in this group has been set and saved.
   Indenting and filling text.

Fill Prefix: [Hide] [Value Menu] None
   [State]: this option is unchanged from its standard setting.
String for filling to insert at front of new line, or nil for none. [More]

Auto Fill Inhibit Regexp: [Hide] [Value Menu] None
   [State]: this option is unchanged from its standard setting.
Regexp to match lines which should not be auto-filled.

Fill Individual Varying Indent: [Hide] [Toggle]  on (non-nil)
   [State]: this option has been set and saved.
Controls criterion for a new paragraph in `fill-individual-paragraphs'. [More]

Sentence End Double Space: [Hide] [Toggle]  on (non-nil)
   [State]: this option is unchanged from its standard setting.
Non-nil means a single space does not end a sentence. [More]

Colon Double Space: [Hide] [Toggle]  off (nil)
   [State]: this option is unchanged from its standard setting.
Non-nil means put two spaces after a colon when filling.

Sentence End Without Period: [Hide] [Toggle]  off (nil)
   [State]: this option is unchanged from its standard setting.
Non-nil means a sentence will end without period. [More]

Adaptive Fill Mode: [Hide] [Toggle]  on (non-nil)
   [State]: this option is unchanged from its standard setting.
Non-nil means determine a paragraph's fill prefix from its text.

Adaptive Fill Regexp: [Show]
   State: hidden, invoke "Show" in the previous line to show.
Regexp to match text at start of line that constitutes indentation. [More]

Adaptive Fill First Line Regexp: [Hide] \`[     ]*\'
   [State]: this option is unchanged from its standard setting.
Regexp specifying whether to set fill prefix from a one-line paragraph. [More]

Adaptive Fill Function: [Hide] nil
   [State]: this option is unchanged from its standard setting.
Function to call to choose a fill prefix for a paragraph. [More]

Default Justification: [Hide] [Value Menu] left
   [State]: this option is unchanged from its standard setting.
Method of justifying text not otherwise specified. [More]

Fill Column: [Hide] 70
   [State]: this option is unchanged from its standard setting.
Column beyond which automatic line-wrapping should happen. [More]

Left Margin: [Hide] 0
   [State]: this option is unchanged from its standard setting.
Column for the default indent-line-function to indent to. [More]

Indent Tabs Mode: [Hide] [Toggle]  off (nil)
   [State]: this option has been set and saved.
Indentation can insert tabs if this is non-nil. [More]

Fill Comments group: [Go to Group] 
Indenting and filling of comments.

\- Fill group end ------------------------------------------------------/

===============================


Recent input:
up up up up up return a f t e r SPC u n d o : up up 
up up up up up up up up up up up up up left : C-k up 
up up up up up up up up up up up up up up up up up 
up up up C-e : up C-SPC escape > M-w M-x e m a c s 
- r e tab backspace backspace tab backspace backspace 
backspace backspace backspace backspace b u tab backspace 
backspace backspace r e tab p tab o tab t backspace 
r tab return

Recent messages:
Saved text from "
before experimental fill (M-q):

| Firs"
Making completion list... [2 times]
Beginning of buffer
Making completion list... [3 times]
Loading emacsbug...
Loading emacsbug...done
M-q runs the command fill-paragraph