Fix mount use after removal/Simplify mounts a bit (#2834)

* remove clone mounted; mounted nodes should never leak into components?

* Remove the mount from vnodes after unmounting them

* Fix use after removal in iterator diffing

* remove logs

* Re-fix keyed list diffing

* Use new.len for diffing keyed lens and remove redundant check

* simplify core list diffing logic a bit

* remove println

* add proper asserts for new tests

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/core/src/lib.rs

@@ -76,9 +76,9 @@ pub use crate::innerlude::{
     fc_to_builder, generation, schedule_update, schedule_update_any, use_hook, vdom_is_rendering,
     AnyValue, Attribute, AttributeValue, CapturedError, Component, ComponentFunction, DynamicNode,
     Element, ElementId, Event, Fragment, HasAttributes, IntoDynNode, MarkerWrapper, Mutation,
-    Mutations, NoOpMutations, Ok, Properties, RenderReturn, Result, Runtime, ScopeId, ScopeState,
-    SpawnIfAsync, Task, Template, TemplateAttribute, TemplateNode, VComponent, VNode, VNodeInner,
-    VPlaceholder, VText, VirtualDom, WriteMutations,
+    Mutations, NoOpMutations, Ok, Properties, Result, Runtime, ScopeId, ScopeState, SpawnIfAsync,
+    Task, Template, TemplateAttribute, TemplateNode, VComponent, VNode, VNodeInner, VPlaceholder,
+    VText, VirtualDom, WriteMutations,
 };
 
 /// The purpose of this module is to alleviate imports of many common types
@@ -94,8 +94,8 @@ pub mod prelude {
         use_hook_with_cleanup, with_owner, AnyValue, Attribute, Callback, Component,
         ComponentFunction, Context, Element, ErrorBoundary, ErrorContext, Event, EventHandler,
         Fragment, HasAttributes, IntoAttributeValue, IntoDynNode, OptionStringFromMarker,
-        Properties, ReactiveContext, RenderError, RenderReturn, Runtime, RuntimeGuard, ScopeId,
-        ScopeState, SuperFrom, SuperInto, SuspendedFuture, SuspenseBoundary, SuspenseBoundaryProps,
+        Properties, ReactiveContext, RenderError, Runtime, RuntimeGuard, ScopeId, ScopeState,
+        SuperFrom, SuperInto, SuspendedFuture, SuspenseBoundary, SuspenseBoundaryProps,
         SuspenseContext, SuspenseExtension, Task, Template, TemplateAttribute, TemplateNode, VNode,
         VNodeInner, VirtualDom,
     };