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rio: allow reading the image of a hidden window thru the window file

--- a/sys/src/cmd/rio/xfid.c

+++ b/sys/src/cmd/rio/xfid.c

@@ -796,11 +796,11 @@

 	case Qwindow:

 		i = w->i;

-		r = w->screenr;

-		if(i == nil || Dx(r)<=0){

+		if(i == nil){

 			filsysrespond(x->fs, x, &fc, Enowindow);

 			return;

 		}

+		r = i->r;

 		goto caseImage;

 	case Qscreen: