feat: improve static content stringiciation

Now a single static vnode can contain stringified content
for multiple consecutive nodes, which greatly improves the
coverage of this optimization.

packages/compiler-core/src/transforms/hoistStatic.ts

@@ -43,6 +43,7 @@ function walk(
   resultCache: Map<TemplateChildNode, boolean>,
   doNotHoistNode: boolean = false
 ) {
+  let hasHoistedNode = false
   for (let i = 0; i < children.length; i++) {
     const child = children[i]
     // only plain elements & text calls are eligible for hoisting.
@@ -55,6 +56,7 @@ function walk(
         ;(child.codegenNode as VNodeCall).patchFlag =
           PatchFlags.HOISTED + (__DEV__ ? ` /* HOISTED */` : ``)
         child.codegenNode = context.hoist(child.codegenNode!)
+        hasHoistedNode = true
         continue
       } else {
         // node may contain dynamic children, but its props may be eligible for
@@ -81,6 +83,7 @@ function walk(
       isStaticNode(child.content, resultCache)
     ) {
       child.codegenNode = context.hoist(child.codegenNode)
+      hasHoistedNode = true
     }
 
     // walk further
@@ -98,7 +101,7 @@ function walk(
     }
   }
 
-  if (context.transformHoist) {
+  if (hasHoistedNode && context.transformHoist) {
     context.transformHoist(children, context)
   }
 }