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libdraw: don't set the Drawop in affinewarp()

It's not used and it messes up with the next draw(2) call.

--- a/sys/src/libdraw/warp.c

+++ b/sys/src/libdraw/warp.c

@@ -9,7 +9,7 @@

 	BPLONG(a+1*3*4+0*4, w[1][0]); BPLONG(a+1*3*4+1*4, w[1][1]); BPLONG(a+1*3*4+2*4, w[1][2]);

 	BPLONG(a+2*3*4+0*4, w[2][0]); BPLONG(a+2*3*4+1*4, w[2][1]); BPLONG(a+2*3*4+2*4, w[2][2]);

 }

-		

+

 void

 affinewarp(Image *dst, Rectangle r, Image *src, Point p, Warp w, int smooth)

 {

@@ -18,12 +18,11 @@

 	if(dst == nil || src == nil)

 		return;

-	_setdrawop(dst->display, S);

-

 	_lockdisplay(dst->display);

 	a = bufimage(dst->display, 1+4+4*4+4+2*4+3*3*4+1);

 	if(a == nil){

 		_unlockdisplay(dst->display);

+		fprint(2, "affinewarp: %r\n");

 		return;

 	}

 	a[0] = 'a';

-- 

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