Handle views of negative height

This fixes an issue where collapsed views did not update the origin
upon focus. Not a perfect fix because it still goes to the top of the list
but good enough to make a new release

view.go

@@ -269,7 +269,7 @@ func (v *View) FocusPoint(cx int, cy int) {
 	_, height := v.Size()
 
 	ly := height - 1
-	if ly == -1 {
+	if ly < 0 {
 		ly = 0
 	}