Deduplicate reactive scope updates/Reset subscriptions on reruns/fix use memo double update (#2506)

* deduplicate effect updates

* only subscribe to signals read in the current run of reactive scopes

* subscribe to memo reads after recomputing the value

packages/core/src/lib.rs

@@ -15,6 +15,7 @@ mod global_context;
 mod mutations;
 mod nodes;
 mod properties;
+mod reactive_context;
 mod render_signal;
 mod runtime;
 mod scheduler;
@@ -42,6 +43,7 @@ pub(crate) mod innerlude {
     pub use crate::mutations::*;
     pub use crate::nodes::*;
     pub use crate::properties::*;
+    pub use crate::reactive_context::*;
     pub use crate::runtime::{Runtime, RuntimeGuard};
     pub use crate::scheduler::*;
     pub use crate::scopes::*;
@@ -79,7 +81,7 @@ pub mod prelude {
         use_hook_with_cleanup, wait_for_next_render, with_owner, AnyValue, Attribute, Callback,
         Component, ComponentFunction, Element, ErrorBoundary, Event, EventHandler, Fragment,
         HasAttributes, IntoAttributeValue, IntoDynNode, OptionStringFromMarker, Properties,
-        Runtime, RuntimeGuard, ScopeId, ScopeState, SuperFrom, SuperInto, Task, Template,
-        TemplateAttribute, TemplateNode, Throw, VNode, VNodeInner, VirtualDom,
+        ReactiveContext, Runtime, RuntimeGuard, ScopeId, ScopeState, SuperFrom, SuperInto, Task,
+        Template, TemplateAttribute, TemplateNode, Throw, VNode, VNodeInner, VirtualDom,
     };
 }