second line of the paragraph, verify the first line has it too.
(adaptive-fill-regexp): Allow - and |;
allow spaces within the prefix. Allow numeric headings.
(adaptive-fill-first-line-regexp): New variable.
(fill-context-prefix): Use adaptive-fill-first-line-regexp.
If prefix from first line seems unreasonable, use whitespace instead.
Reject it entirely only if it is a paragraph-starter.
Don't add extra newline at end if there is no text in paragraph --
doing so can make fill-region loop.
When testing for indentation exceeding fill-column, skip back over tabs too.
(fill-context-prefix): Use adaptive-fill-regexp only if non-nil.
(fill-context-prefix): Check adaptive-fill-function non-nil.
is supposed to match text STARTING at the left margin, use
`looking-at' rather than `re-search-forward'.
(fill-individual-paragraphs): Match fill-prefixes starting at left-margin.
(fill-context-prefix): New function.
(fill-region-as-paragraph): Don't insert extra space
at end of filled region.
(fill-individual-paragraphs): Insist on nonempty header name,
in the special mailp case.
on first line of paragraph if it's a paragraph-separate line.
Don't look past the intended line.
(adaptive-fill-function): New variable.
(fill-region-as-paragraph): Use it.
(colon-double-space): New variable.
(canonically-space-region): Put two spaces after colon if necessary.
(fill-region-as-paragraph): In adaptive-fill-mode,
if paragraph has one line, take the fill prefix from it.
(adaptive-fill-regexp): Doc fix.
(fill-individual-paragraphs): Use `adaptive-fill-regexp'
to determine `fill-prefix' if `adaptive-fill-mode' is non-nil.
(fill-region-as-paragraph): don't delete hard newlines. ignore whitespace
at beginning of region. Remove justification indentation.
(fill-region): Don't use paragraph-movement commands when use-hard-newlines
is true, just search for hard newlines.
(current-justification): take care at EOB.
(set-justification): new argWHOLE-PAR. Callers changed.
(justify-current-line): Error if JUSTIFY arg is not reasonable.
Better interaction if there is a fill-prefix.
"Line too long" warning removed.
(unjustify-current-line, unjustify-region): New functions.
