fix: switch to future based diffing

this commit removes the old manual fiber implementation in favor of a
traditional recursion based approach. This should make the diffing
algorithm easier to work on and eliminate various stack-based bugs in.

packages/core/src/mutations.rs

@@ -143,6 +143,10 @@ impl<'a> Mutations<'a> {
         self.edits.push(InsertBefore { n, root });
     }
 
+    pub(crate) fn append_children(&mut self, n: u32) {
+        self.edits.push(AppendChildren { many: n });
+    }
+
     // Remove Nodes from the dom
     pub(crate) fn remove(&mut self, id: u64) {
         self.edits.push(Remove { root: id });
@@ -217,6 +221,10 @@ impl<'a> Mutations<'a> {
         let name = attribute.name;
         self.edits.push(RemoveAttribute { name, root });
     }
+
+    pub(crate) fn mark_dirty_scope(&mut self, scope: ScopeId) {
+        self.dirty_scopes.insert(scope);
+    }
 }
 
 // refs are only assigned once