Prevent penultimate column's formatting from overflowing on last column's text

src/components/buflist.rs

@@ -222,7 +222,7 @@ impl Component for Buflist {
           Rect {
             x,
             y,
-            width: if allow_overflow {
+            width: if allow_overflow && y as usize > buffers.len() % (area.height as usize) {
               area.width
             } else {
               column_width