T23c round 2 fix

- a trigger opens only its word, so a path keeps its slashes in the query
- suggestions reveal the cursor once the list has its bounds: Popup takes a
  row to reveal, and a canvas inside the list asks for it and one more frame

src/forms/select.rs

@@ -224,6 +224,7 @@ pub(crate) fn listing(
                         Picker::show(&close, false, at, cx)
                     })),
                     scroll: Some(&scroll),
+                    reveal: None,
                 }
                 .render(window, cx),
             )