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fmt: format a single line if line settings change

Reported by Pierre-Jean Fichet <[email protected]>.

--- a/fmt.c

+++ b/fmt.c

@@ -582,7 +582,7 @@

 }

 /* extract the first nreq formatted lines before the word at pos */

-static int fmt_head(struct fmt *f, int nreq, int pos)

+static int fmt_head(struct fmt *f, int nreq, int pos, int nohy)

 {

 	int best = pos;		/* best line break for nreq-th line */

 	int prev, next;		/* best line breaks without hyphenation */

@@ -593,6 +593,8 @@

 		best = fmt_bestpos(f, best);

 	prev = best;

 	next = best;

+	if (!nohy)

+		return best;

 	/* finding closest line breaks without hyphenation */

 	while (prev > 1 && f->words[prev - 1].hy &&

 			fmt_bestdep(f, prev - 1) == nreq)

@@ -648,7 +650,12 @@

 	/* not enough words to fill */

 	if ((f->fillreq <= 0 || f->words_n < f->fillreq) && llen <= FMT_LLEN(f))

 		return 0;

-	nreq = (n_hy & HY_LAST) ? fmt_safelines() : 0;

+	/* lines until a trap or page end */

+	nreq = fmt_safelines();

+	/* if line settings are changed, output a single line */

+	if (fmt_confchanged(f))

+		nreq = 1;

+	/* enough lines are collected already */

 	if (nreq > 0 && nreq <= fmt_nlines(f))

 		return 1;

 	/* resetting positions */

@@ -661,7 +668,10 @@

 		f->best_pos[i] = -1;

 	end = fmt_breakparagraph(f, f->words_n, br);

 	if (nreq > 0) {

-		end_head = fmt_head(f, nreq - fmt_nlines(f), end);

+		int nohy = 0;	/* do not hyphenate the last line */

+		if (n_hy & HY_LAST && nreq == fmt_nlines(f))

+			nohy = 1;

+		end_head = fmt_head(f, nreq - fmt_nlines(f), end, nohy);

 		head = end_head < end;

 		end = end_head;

 	}