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page: can't just cover whole display

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

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

@@ -160,10 +160,14 @@

 	/* add rio border */

 	size = addpt(size, Pt(Borderwidth*2, Borderwidth*2));

 	if(display->image){

-		if(size.x > Dx(display->image->r))

-			size.x = Dx(display->image->r);

-		if(size.y > Dy(display->image->r))

-			size.y = Dy(display->image->r);

+		Point dsize = subpt(display->image->r.max, display->image->r.min);

+		if(size.x > dsize.x)

+			size.x = dsize.x;

+		if(size.y > dsize.y)

+			size.y = dsize.y;

+		/* can't just conver whole display */

+		if(eqpt(size, dsize))

+			size.y--;

 	}

 	fprint(wctl, "resize -dx %d -dy %d\n", size.x, size.y);

 	close(wctl);

-- 

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