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audio/zuke: clip scrolling to the edges

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

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

@@ -303,9 +303,6 @@

 	uvlong dur, msec;

 	char tmp[32];

-	updatescrollsz();

-	scroll = CLAMP(scroll, 0, pl->n - scrollsz);

-

 	lockdisplay(display);

 	if(back == nil || Dx(screen->r) != Dx(back->r) || Dy(screen->r) != Dy(back->r)){

@@ -1406,6 +1403,9 @@

 			else if(pcur > scroll + scrollsz)

 				scroll = pcur - scrollsz;

 		}

+

+		updatescrollsz();

+		scroll = CLAMP(scroll, 0, pl->n - scrollsz);

 		if(scroll != oscroll || pcur != oldpcur)

 			redraw(1);