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audio/zuke: fix off-by-one in playlist loading; initialize scrolling to avoid jump on first track

--- a/sys/src/cmd/audio/zuke/zuke.c

+++ b/sys/src/cmd/audio/zuke/zuke.c

@@ -897,8 +897,8 @@

 		*e++ = 0;

 		switch(s[-2]){

 		case 0:

-			if(m->path != nil){

 addit:

+			if(m->path != nil){

 				for(i = 0; cols[i] != 0; i++){

 					if((x = stringwidth(f, getcol(m, cols[i]))) > mincolwidth[i])

 						mincolwidth[i] = x;

@@ -1222,6 +1222,7 @@

 		recenter();

 	}

+	updatescrollsz();

 	redraw(1);

 	m.buttons = 0;

 	scrolling = 0;