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plumb: fix wrong click attribute offset (thanks umbraticus)

--- a/sys/src/cmd/plumb/match.c

+++ b/sys/src/cmd/plumb/match.c

@@ -48,13 +48,12 @@

 clickmatch(Reprog *re, char *text, Resub rs[10], int click)

 {

 	char *clickp;

-	int i, w;

+	int i;

 	Rune r;

 	/* click is in characters, not bytes */

-	for(i=0; i<click && text[i]!='\0'; i+=w)

-		w = chartorune(&r, text+i);

-	clickp = text+i;

+	for(i=0, clickp=text; i<click && *clickp!='\0'; i++)

+		clickp += chartorune(&r, clickp);

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

 		memset(rs, 0, 10*sizeof(Resub));

 		if(regexec(re, text+i, rs, 10))