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resize: fix wrong image size when using non ZP origin

--- a/sys/src/cmd/resize.c

+++ b/sys/src/cmd/resize.c

@@ -160,7 +160,9 @@

 			freememimage(im);

 			im = nim;

 		}

-		if((nim = allocmemimage(Rect(im->r.min.x, im->r.min.y, xsize, ysize), tchan)) == nil)

+		if((nim = allocmemimage(

+			Rect(im->r.min.x, im->r.min.y, im->r.min.x+xsize, im->r.min.y+ysize), 

+			tchan)) == nil)

 			sysfatal("addocmemimage: %r");

 		resample(nim, nim->r, im, im->r);

 		freememimage(im);

-- 

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