Prune commentary and stale Rust port notes

core/src/widget/mod.rs

@@ -18,12 +18,10 @@ pub use widgets::*;
 pub trait Widget: Any {
     fn draw(&mut self, painter: &mut Painter);
 
-    /// An exact, context-free length known without drawing or inspecting children.
     fn size_hint(&self, _axis: Axis) -> Option<Len> {
         None
     }
 
-    /// Whether the draw result is independent of the offered region.
     fn is_size_independent(&self) -> bool {
         false
     }
@@ -32,12 +30,10 @@ pub trait Widget: Any {
         false
     }
 
-    /// The AccessKit role for a labelled widget.
     fn access_role(&self) -> accesskit::Role {
         accesskit::Role::Unknown
     }
 
-    /// Advance an animation and report whether it needs another frame.
     #[allow(unused_variables)]
     fn tick(&mut self, now: std::time::Instant) -> bool {
         false
@@ -68,9 +64,6 @@ impl dyn Widget {
     }
 }
 
-/// A function that returns a widget given a UI.
-/// Useful for defining trait functions on widgets that create a parent widget so that the children
-/// don't need to be IDs yet
 pub trait WidgetFn<State, W: Widget + ?Sized>: FnOnce(&mut State) -> W {}
 impl<State, W: Widget + ?Sized, F: FnOnce(&mut State) -> W> WidgetFn<State, W> for F {}