Prune commentary and stale Rust port notes

tabs-ui/Cargo.toml

@@ -3,11 +3,7 @@ name = "tabs-ui"
 version.workspace = true
 edition.workspace = true
 
-# The tabs example's widget tree, factored out of iris/examples/tabs/main.rs
-# so it can be built once and driven by either backend: the winit example
-# binary, and iris/android-app's cdylib. Its own crate rather than a pub
-# module of `iris` because it is demo content, not library surface -- see
-# RUST.md's I2.
+# Shared demo content for the desktop and Android example entry points.
 
 [dependencies]
 iris = { path = ".." }

tabs-ui/src/lib.rs

@@ -1,13 +1,3 @@
-//! The tabs example's widget tree -- the five demo panes plus the message
-//! composer that exercises `TextEdit`. Factored out of
-//! `iris/examples/tabs/main.rs` (I2, RUST.md) so the same UI runs under
-//! both backends: the winit example binary calls `build` from
-//! `DefaultAppState::new`, and `iris-android-app`'s cdylib calls it from
-//! `AndroidAppState::new`. Nothing here mentions either backend by name --
-//! it only needs `Rsc: HasEvents` (for `.on(...)`) and `Rsc::State:
-//! FocusHost` (for `.attr::<Selectable>(())`), both of which every backend
-//! implements.
-
 use iris::prelude::*;
 use std::{cell::RefCell, rc::Rc};
 
@@ -181,12 +171,6 @@ where
             .on(CursorSense::HoverEnd, move |ctx, rsc| {
                 ctx.widget(rsc).color = color;
             })
-            // I4 (RUST.md): the tabs screen's only named controls, and the
-            // ones the emulator step at the bottom of that box taps by
-            // name -- `ui-trace record --do "tap 'pad'"` and so on. `.label`
-            // slots into this chain like any other widget combinator
-            // (`RefFnTag` in `core/src/widget/tag.rs`); it does not have to
-            // be the last thing before `.add`.
             .label(label);
         (rect, wtext(label).size(30).text_align(Align::CENTER)).stack()
     };