refactor: simplify static content insertion

packages/runtime-core/src/renderer.ts

@@ -142,9 +142,8 @@ export interface RendererOptions<
     content: string,
     parent: HostElement,
     anchor: HostNode | null,
-    isSVG: boolean,
-    cached?: HostNode[] | null
-  ): HostElement[]
+    isSVG: boolean
+  ): [HostNode, HostNode]
 }
 
 // Renderer Node can technically be any object in the context of core renderer
@@ -633,22 +632,12 @@ function baseCreateRenderer(
   ) => {
     // static nodes are only present when used with compiler-dom/runtime-dom
     // which guarantees presence of hostInsertStaticContent.
-    const nodes = hostInsertStaticContent!(
+    ;[n2.el, n2.anchor] = hostInsertStaticContent!(
       n2.children as string,
       container,
       anchor,
-      isSVG,
-      // pass cached nodes if the static node is being mounted multiple times
-      // so that runtime-dom can simply cloneNode() instead of inserting new
-      // HTML
-      n2.staticCache
+      isSVG
     )
-    // first mount - this is the orignal hoisted vnode. cache nodes.
-    if (!n2.el) {
-      n2.staticCache = nodes
-    }
-    n2.el = nodes[0]
-    n2.anchor = nodes[nodes.length - 1]
   }
 
   /**

packages/runtime-core/src/vnode.ts

@@ -168,7 +168,6 @@ export interface VNode<
   target: HostElement | null // teleport target
   targetAnchor: HostNode | null // teleport target anchor
   staticCount?: number // number of elements contained in a static vnode
-  staticCache?: HostNode[] // cache of parsed static nodes for faster repeated insertions
 
   // suspense
   suspense: SuspenseBoundary | null
@@ -521,7 +520,6 @@ export function cloneVNode<T, U>(
     target: vnode.target,
     targetAnchor: vnode.targetAnchor,
     staticCount: vnode.staticCount,
-    staticCache: vnode.staticCache,
     shapeFlag: vnode.shapeFlag,
     // if the vnode is cloned with extra props, we can no longer assume its
     // existing patch flag to be reliable and need to add the FULL_PROPS flag.