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zuke: fix middle-click restarting playback if held while mouse pointer is moving

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

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

@@ -1145,7 +1145,7 @@

 	}

 	redraw(1);

-	oldbuttons = 0;

+	m.buttons = 0;

 	scrolling = 0;

 	proccreate(plumbaudio, kctl->c, 4096);

@@ -1157,6 +1157,7 @@

 			redraw(0);

 		}

+		oldbuttons = m.buttons;

 		switch(alt(a)){

 		case Emouse:

 			if(ptinrect(m.xy, seekbar)){

@@ -1182,16 +1183,9 @@

 				break;

 			}

-

-			if(oldbuttons == 0 && !scrolling && ptinrect(m.xy, insetrect(seekbar, -4))){

-				if(ptinrect(m.xy, seekbar))

-					seekrel(playercurr, seekoff/1000.0 - byteswritten/Bps);

-				break;

-			}

-

 			n = (m.xy.y - screen->r.min.y)/f->height;

-			if(oldbuttons == 0 && m.xy.x <= screen->r.min.x+Scrollwidth){

+			if(m.xy.x <= screen->r.min.x+Scrollwidth){

 				if(m.buttons == 1){

 					scroll = MAX(0, scroll-n-1);

 					redraw(1);

@@ -1205,6 +1199,12 @@

 				}

 			}

+			if(!scrolling && ptinrect(m.xy, insetrect(seekbar, -4))){

+				if(ptinrect(m.xy, seekbar))

+					seekrel(playercurr, seekoff/1000.0 - byteswritten/Bps);

+				break;

+			}

+

 			if(scrolling){

 				if(scrollsz >= pl->n)

 					break;

@@ -1215,7 +1215,7 @@

 				n += scroll;

 				if(n < pl->n){

 					pcur = n;

-					if(m.buttons == 2){

+					if(m.buttons == 2 && oldbuttons == 0){

 						stop(playercurr);

 						playercurr = newplayer(pcur, 1);

 						start(playercurr);