WrapperWidget::root_behavior default passthrough

CHANGELOG.md

@@ -34,6 +34,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `Window::focused` now accepts an `IntoValue` implementor instead of
   `IntoDynamic`. Additionally, the initial value is now used to control whether
   the OS should initially activate the window when it is opened.
+- `WrapperWidget::root_behavior`'s provided implementation now returns
+  `Some(RootBehavior::PassThrough)` to reflect the general intention of what
+  `WrapperWidget` implementors are generally doing. Previously, `None` was
+  returned.
 
 ### Changed
 

src/widget.rs

@@ -532,9 +532,13 @@ pub trait WrapperWidget: Debug + Send + 'static {
 
     /// Returns the behavior this widget should apply when positioned at the
     /// root of the window.
+    ///
+    /// The provided implementation for `WrapperWidget` returns
+    /// [`RootBehavior::PassThrough`]. This is different from the provided
+    /// implementation for [`Widget`].
     #[allow(unused_variables)]
     fn root_behavior(&mut self, context: &mut EventContext<'_>) -> Option<RootBehavior> {
-        None
+        Some(RootBehavior::PassThrough)
     }
 
     /// Draws the background of the widget.