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.
(set-justification-{none,left,right,full,center}): New functions.
(fill-region-as-paragraph, fill-region, justify-current-line): New
arg NOSQUEEZE defeats normal removal of extra whitespace.
(fill-region-as-paragraph, fill-region)
(fill-nonuniform-paragraphs, fill-individual-paragraphs):
Arg JUSTIFY-FLAG (JUSTIFYP) renamed to JUSTIFY.
(fill-region-as-paragraph): Obey left-margin; fill-prefix starts
after left-margin. Disable filling if JUSTIFY == none, but indent to
margin anyway.
Adaptive-fill removes text-props from fill-prefixes it finds.
Adaptive-fill no longer has to notice left-margin: std fill does that.
Use fill-column and canonically-space-region functions.
(canonically-space-region): New fn split from fill-region-as-paragraph.
(fill-region): New args NOSQUEEZE (as above) and TO-EOP.
(default-justification): New variable.
(current-left-margin, fill-column, justification): New functions.
(fill-paragraph): Use fill-region-as-paragraph when possible.
(justify-current-line): New arguments; different kinds of
justification handled. Uses left-margin and fill-column functions.
at end of paragraph, to make sure text-properties are preserved.
(fill-paragraph): Call fill-region, not fill-region-as-paragraph,
to avoid clobbering paragraph-internal hard-newlines.
(fill-region): If use-hard-newlines is on, divide into
"paragraphs" by breaking at every hard newline, temporarily
ignoring paragraph-start.
don't fill the text before that, but count it for indentation.
(fill-region): If region starts in mid-line, keep whole line
in the region, but pass the region start to fill-region-as-paragraph.
after the fill column, don't stop at period with just one space.
When checking whether at beginning of line, if no fill prefix,
ignore intervening whitespace.
