another try at adding AddAnyAttr to AnyView

tachys/src/view/any_view.rs

@@ -5,7 +5,12 @@ use super::{
     RenderHtml,
 };
 use crate::{
-    html::attribute::Attribute, hydration::Cursor, ssr::StreamBuilder,
+    html::attribute::{
+        any_attribute::{AnyAttribute, IntoAnyAttribute},
+        Attribute,
+    },
+    hydration::Cursor,
+    ssr::StreamBuilder,
 };
 use std::{
     any::{Any, TypeId},
@@ -29,6 +34,7 @@ pub struct AnyView {
     value: Box<dyn Any + Send>,
     build: fn(Box<dyn Any>) -> AnyViewState,
     rebuild: fn(TypeId, Box<dyn Any>, &mut AnyViewState),
+    add_any_attr: fn(Box<dyn Any>, AnyAttribute) -> AnyView,
     // The fields below are cfg-gated so they will not be included in WASM bundles if not needed.
     // Ordinarily, the compiler can simply omit this dead code because the methods are not called.
     // With this type-erased wrapper, however, the compiler is not *always* able to correctly
@@ -130,7 +136,6 @@ where
 {
     // inlining allows the compiler to remove the unused functions
     // i.e., doesn't ship HTML-generating code that isn't used
-    #[inline(always)]
     fn into_any(self) -> AnyView {
         #[cfg(feature = "ssr")]
         let html_len = self.html_len();
@@ -282,11 +287,19 @@ where
                         }
                     };
 
+                let add_any_attr = |value: Box<dyn Any>, attr: AnyAttribute| {
+                    let value = value
+                        .downcast::<T>()
+                        .expect("AnyView::add_any_attr could not be downcast");
+                    value.add_any_attr(attr).into_any()
+                };
+
                 AnyView {
                     type_id: TypeId::of::<T>(),
                     value,
                     build,
                     rebuild,
+                    add_any_attr,
                     #[cfg(feature = "ssr")]
                     resolve,
                     #[cfg(feature = "ssr")]
@@ -324,12 +337,13 @@ impl AddAnyAttr for AnyView {
 
     fn add_any_attr<NewAttr: Attribute>(
         self,
-        _attr: NewAttr,
+        attr: NewAttr,
     ) -> Self::Output<NewAttr>
     where
         Self::Output<NewAttr>: RenderHtml,
     {
-        self
+        let attr = attr.into_cloneable_owned();
+        (self.add_any_attr)(self.value, attr.into_any_attr())
     }
 }