web: don't show progress bar until 400px have scrolled

web/src/state.rs

@@ -62,6 +62,8 @@ fn compute_scroll_ratio() -> Msg {
     // the tags at the end on mobile/tablet).
     let body = document().body().expect("body");
     let sh = body.scroll_height() as f64;
+    // HACK: don't report percent until a fixed amount of scrolling has happened
+    let sh = if sh < 400. { 0. } else { sh };
     let window = window();
     let ih = window
         .inner_height()