iris: add positioned text overflow

examples/tabs/lib.rs

@@ -123,7 +123,7 @@ where
                 .editable(EditMode::MultiLine)
                 .size(30)
                 .text_align(Align::LEFT)
-                .wrap(true)
+                .overflow(TextOverflow::Wrap)
                 .attr::<Selectable>(());
             let fill = rsc
                 .ui_mut()