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upas/Mail: avoid showing empty To: and CC: lines in compose windows

--- a/sys/src/cmd/upas/Mail/comp.c

+++ b/sys/src/cmd/upas/Mail/comp.c

@@ -200,13 +200,17 @@

 	if(naddrs == 0)

 		return;

 	qsort(addrs, naddrs, sizeof(char*), strpcmp);

+	for(i = 1; i < naddrs; i++){

+		if(strcmp(addrs[i-1], addrs[i]) == 0)

+			addrs[i-1] = nil;

+	}

 	Bprint(fd, "%s: ", type);

 	for(i = 0; i < naddrs; i++){

-		if(i > 0 && strcmp(addrs[i-1], addrs[i]) == 0)

+		if(addrs[i] == nil)

 			continue;

 		w += Bprint(fd, "%s%s", sep, addrs[i]);

 		sep = ", ";

-		if(w > 50){

+		if(w > 50 && i < naddrs-1){

 			w = 0;

 			sep = "";

 			Bprint(fd, "\n%s: ", type);