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rio: rect outside screen counts as covered wcovered()

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

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

@@ -662,6 +662,8 @@

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

 		return 1;

+	if(!rectclip(&r, screen->r))

+		return 1;

 	for(; i<nwindow; i++){

 		t = window[i];

 		if(t == w || t->topped <= w->topped || t->deleted)

-- 

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