sub_width has no impact on tests, also removing

src/items.rs

@@ -630,7 +630,7 @@ impl<'a> FmtVisitor<'a> {
             items = itemize_list_with(0);
         }
 
-        let shape = self.shape().sub_width(2)?;
+        let shape = self.shape();
         let fmt = ListFormatting::new(shape, self.config)
             .trailing_separator(self.config.trailing_comma())
             .preserve_newline(true);