From 399fec770f4f56c1df85a6f2d4858bc3f8c11c9a Mon Sep 17 00:00:00 2001
From: Rahul A Mistry <149420892+ProdigyRahul@users.noreply.github.com>
Date: Sun, 25 Jan 2026 05:59:58 +0530
Subject: fix(app): markdown rendering with morphdom for better dom functions
 (#10373)

---
 packages/ui/package.json                |  1 +
 packages/ui/src/components/markdown.tsx | 55 +++++++++++++++++++++++++++++----
 2 files changed, 50 insertions(+), 6 deletions(-)

(limited to 'packages/ui')

diff --git a/packages/ui/package.json b/packages/ui/package.json
index 20709f160..f384797f4 100644
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -56,6 +56,7 @@
     "marked": "catalog:",
     "marked-katex-extension": "5.1.6",
     "marked-shiki": "catalog:",
+    "morphdom": "2.7.8",
     "remeda": "catalog:",
     "shiki": "catalog:",
     "solid-js": "catalog:",
diff --git a/packages/ui/src/components/markdown.tsx b/packages/ui/src/components/markdown.tsx
index f7a1ec16f..e3102214b 100644
--- a/packages/ui/src/components/markdown.tsx
+++ b/packages/ui/src/components/markdown.tsx
@@ -1,6 +1,7 @@
 import { useMarked } from "../context/marked"
 import { useI18n } from "../context/i18n"
 import DOMPurify from "dompurify"
+import morphdom from "morphdom"
 import { checksum } from "@opencode-ai/util/encode"
 import { ComponentProps, createEffect, createResource, createSignal, onCleanup, splitProps } from "solid-js"
 import { isServer } from "solid-js/web"
@@ -194,18 +195,61 @@ export function Markdown(
     { initialValue: "" },
   )
 
+  let copySetupTimer: ReturnType<typeof setTimeout> | undefined
+  let copyCleanup: (() => void) | undefined
+
   createEffect(() => {
     const container = root()
     const content = html()
     if (!container) return
-    if (!content) return
     if (isServer) return
-    const cleanup = setupCodeCopy(container, {
-      copy: i18n.t("ui.message.copy"),
-      copied: i18n.t("ui.message.copied"),
+
+    if (!content) {
+      container.innerHTML = ""
+      return
+    }
+
+    const temp = document.createElement("div")
+    temp.innerHTML = content
+
+    morphdom(container, temp, {
+      childrenOnly: true,
+      onBeforeElUpdated: (fromEl, toEl) => {
+        if (fromEl.isEqualNode(toEl)) return false
+        if (fromEl.getAttribute("data-component") === "markdown-code") {
+          const fromPre = fromEl.querySelector("pre")
+          const toPre = toEl.querySelector("pre")
+          if (fromPre && toPre && !fromPre.isEqualNode(toPre)) {
+            morphdom(fromPre, toPre)
+          }
+          return false
+        }
+        return true
+      },
+      onBeforeNodeDiscarded: (node) => {
+        if (node instanceof Element) {
+          if (node.getAttribute("data-slot") === "markdown-copy-button") return false
+          if (node.getAttribute("data-component") === "markdown-code") return false
+        }
+        return true
+      },
     })
-    onCleanup(cleanup)
+
+    if (copySetupTimer) clearTimeout(copySetupTimer)
+    copySetupTimer = setTimeout(() => {
+      if (copyCleanup) copyCleanup()
+      copyCleanup = setupCodeCopy(container, {
+        copy: i18n.t("ui.message.copy"),
+        copied: i18n.t("ui.message.copied"),
+      })
+    }, 150)
   })
+
+  onCleanup(() => {
+    if (copySetupTimer) clearTimeout(copySetupTimer)
+    if (copyCleanup) copyCleanup()
+  })
+
   return (
     <div
       data-component="markdown"
@@ -213,7 +257,6 @@ export function Markdown(
         ...(local.classList ?? {}),
         [local.class ?? ""]: !!local.class,
       }}
-      innerHTML={html.latest}
       ref={setRoot}
       {...others}
     />
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