fix: replace inline component with component$ with the same key

.changeset/mean-parents-buy.md

@@ -0,0 +1,5 @@
+---
+'@qwik.dev/core': patch
+---
+
+fix: replace inline component with component$ with the same key

packages/qwik/src/core/client/vnode-diff.ts

@@ -1079,10 +1079,8 @@ export const vnode_diff = (
         shouldRender = true;
       } else if (!hashesAreEqual) {
         insertNewComponent(host, componentQRL, jsxProps);
-        if (vNewNode) {
-          host = vNewNode as VirtualVNode;
-          shouldRender = true;
-        }
+        host = vNewNode as VirtualVNode;
+        shouldRender = true;
       }
 
       if (host) {
@@ -1103,6 +1101,7 @@ export const vnode_diff = (
       const lookupKey = jsxNode.key;
       const vNodeLookupKey = getKey(host);
       const lookupKeysAreEqual = lookupKey === vNodeLookupKey;
+      const vNodeComponentHash = getComponentHash(host, container.$getObjectById$);
 
       if (!lookupKeysAreEqual) {
         // See if we already have this inline component later on.
@@ -1116,6 +1115,11 @@ export const vnode_diff = (
         }
         host = vNewNode as VirtualVNode;
       }
+      // inline components don't have component hash - q:renderFn prop, so it should be null
+      else if (vNodeComponentHash != null) {
+        insertNewInlineComponent();
+        host = vNewNode as VirtualVNode;
+      }
 
       if (host) {
         let componentHost: VNode | null = host;

packages/qwik/src/core/tests/inline-component.spec.tsx

@@ -36,6 +36,10 @@ const InlineWrapper = () => {
 
 const Id = (props: any) => <div>Id: {props.id}</div>;
 
+const ChildInline = () => {
+  return <div>Child inline</div>;
+};
+
 describe.each([
   { render: ssrRenderToDom }, //
   { render: domRender }, //
@@ -631,4 +635,73 @@ describe.each([
       </InlineComponent>
     );
   });
+
+  it('should render swap component$ and inline component with the same key', async () => {
+    const Child = component$(() => {
+      return <div>Child component$</div>;
+    });
+
+    const Parent = component$(() => {
+      const toggle = useSignal(true);
+      return (
+        <>
+          <button onClick$={() => (toggle.value = !toggle.value)}></button>
+          {/* same key, simulate different routes and files, but the same keys at the same place */}
+          {toggle.value ? <ChildInline key="samekey" /> : <Child key="samekey" />}
+        </>
+      );
+    });
+
+    const { vNode, document } = await render(<Parent />, { debug });
+
+    expect(vNode).toMatchVDOM(
+      <Component ssr-required>
+        <Fragment ssr-required>
+          <button></button>
+          <InlineComponent ssr-required>
+            <div>Child inline</div>
+          </InlineComponent>
+        </Fragment>
+      </Component>
+    );
+
+    await trigger(document.body, 'button', 'click');
+
+    expect(vNode).toMatchVDOM(
+      <Component ssr-required>
+        <Fragment ssr-required>
+          <button></button>
+          <Component ssr-required>
+            <div>Child component$</div>
+          </Component>
+        </Fragment>
+      </Component>
+    );
+
+    await trigger(document.body, 'button', 'click');
+
+    expect(vNode).toMatchVDOM(
+      <Component ssr-required>
+        <Fragment ssr-required>
+          <button></button>
+          <InlineComponent ssr-required>
+            <div>Child inline</div>
+          </InlineComponent>
+        </Fragment>
+      </Component>
+    );
+
+    await trigger(document.body, 'button', 'click');
+
+    expect(vNode).toMatchVDOM(
+      <Component ssr-required>
+        <Fragment ssr-required>
+          <button></button>
+          <Component ssr-required>
+            <div>Child component$</div>
+          </Component>
+        </Fragment>
+      </Component>
+    );
+  });
 });