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rio: allow windows as small as one line of text, still scrollable

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

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

@@ -95,7 +95,7 @@

 		return 0;

 	if(Dy(r) > BIG*Dy(screen->r))

 		return 0;

-	if(Dx(r) < 100 || Dy(r) < 3*font->height)

+	if(Dx(r) < 100 || Dy(r) < 3*Borderwidth+font->height)

 		return 0;

 	/* window must be on screen */

 	if(!rectXrect(screen->r, r))

-- 

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