fix(app): defer diff rendering

packages/app/src/pages/session.tsx

@@ -1,4 +1,16 @@
-import { onCleanup, Show, Match, Switch, createMemo, createEffect, on, onMount, untrack } from "solid-js"
+import {
+  onCleanup,
+  Show,
+  Match,
+  Switch,
+  createMemo,
+  createEffect,
+  createComputed,
+  on,
+  onMount,
+  untrack,
+  createSignal,
+} from "solid-js"
 import { createMediaQuery } from "@solid-primitives/media"
 import { createResizeObserver } from "@solid-primitives/resize-observer"
 import { useLocal } from "@/context/local"
@@ -406,6 +418,18 @@ export default function Page() {
     newSessionWorktree: "main",
   })
 
+  const [deferRender, setDeferRender] = createSignal(false)
+  createComputed((prev) => {
+    const key = sessionKey()
+    if (key !== prev) {
+      setDeferRender(true)
+      requestAnimationFrame(() => {
+        setTimeout(() => setDeferRender(false), 0)
+      })
+    }
+    return key
+  }, sessionKey())
+
   const turnDiffs = createMemo(() => lastUserMessage()?.summary?.diffs ?? [])
   const reviewDiffs = createMemo(() => (store.changes === "session" ? diffs() : turnDiffs()))
 
@@ -712,35 +736,15 @@ export default function Page() {
     loadingClass: string
     emptyClass: string
   }) => (
-    <Switch>
-      <Match when={store.changes === "turn" && !!params.id}>
-        <SessionReviewTab
-          title={changesTitle()}
-          empty={emptyTurn()}
-          diffs={reviewDiffs}
-          view={view}
-          diffStyle={input.diffStyle}
-          onDiffStyleChange={input.onDiffStyleChange}
-          onScrollRef={(el) => setTree("reviewScroll", el)}
-          focusedFile={tree.activeDiff}
-          onLineComment={(comment) => addCommentToContext({ ...comment, origin: "review" })}
-          onLineCommentUpdate={updateCommentInContext}
-          onLineCommentDelete={removeCommentFromContext}
-          lineCommentActions={reviewCommentActions()}
-          comments={comments.all()}
-          focusedComment={comments.focus()}
-          onFocusedCommentChange={comments.setFocus}
-          onViewFile={openReviewFile}
-          classes={input.classes}
-        />
-      </Match>
-      <Match when={hasReview()}>
-        <Show
-          when={diffsReady()}
-          fallback={<div class={input.loadingClass}>{language.t("session.review.loadingChanges")}</div>}
-        >
+    <Show
+      when={!deferRender()}
+      fallback={<div class={input.loadingClass}>{language.t("session.review.loadingChanges")}</div>}
+    >
+      <Switch>
+        <Match when={store.changes === "turn" && !!params.id}>
           <SessionReviewTab
             title={changesTitle()}
+            empty={emptyTurn()}
             diffs={reviewDiffs}
             view={view}
             diffStyle={input.diffStyle}
@@ -757,39 +761,64 @@ export default function Page() {
             onViewFile={openReviewFile}
             classes={input.classes}
           />
-        </Show>
-      </Match>
-      <Match when={true}>
-        <SessionReviewTab
-          title={changesTitle()}
-          empty={
-            store.changes === "turn" ? (
-              emptyTurn()
-            ) : (
-              <div class={input.emptyClass}>
-                <Mark class="w-14 opacity-10" />
-                <div class="text-14-regular text-text-weak max-w-56">{language.t(reviewEmptyKey())}</div>
-              </div>
-            )
-          }
-          diffs={reviewDiffs}
-          view={view}
-          diffStyle={input.diffStyle}
-          onDiffStyleChange={input.onDiffStyleChange}
-          onScrollRef={(el) => setTree("reviewScroll", el)}
-          focusedFile={tree.activeDiff}
-          onLineComment={(comment) => addCommentToContext({ ...comment, origin: "review" })}
-          onLineCommentUpdate={updateCommentInContext}
-          onLineCommentDelete={removeCommentFromContext}
-          lineCommentActions={reviewCommentActions()}
-          comments={comments.all()}
-          focusedComment={comments.focus()}
-          onFocusedCommentChange={comments.setFocus}
-          onViewFile={openReviewFile}
-          classes={input.classes}
-        />
-      </Match>
-    </Switch>
+        </Match>
+        <Match when={hasReview()}>
+          <Show
+            when={diffsReady()}
+            fallback={<div class={input.loadingClass}>{language.t("session.review.loadingChanges")}</div>}
+          >
+            <SessionReviewTab
+              title={changesTitle()}
+              diffs={reviewDiffs}
+              view={view}
+              diffStyle={input.diffStyle}
+              onDiffStyleChange={input.onDiffStyleChange}
+              onScrollRef={(el) => setTree("reviewScroll", el)}
+              focusedFile={tree.activeDiff}
+              onLineComment={(comment) => addCommentToContext({ ...comment, origin: "review" })}
+              onLineCommentUpdate={updateCommentInContext}
+              onLineCommentDelete={removeCommentFromContext}
+              lineCommentActions={reviewCommentActions()}
+              comments={comments.all()}
+              focusedComment={comments.focus()}
+              onFocusedCommentChange={comments.setFocus}
+              onViewFile={openReviewFile}
+              classes={input.classes}
+            />
+          </Show>
+        </Match>
+        <Match when={true}>
+          <SessionReviewTab
+            title={changesTitle()}
+            empty={
+              store.changes === "turn" ? (
+                emptyTurn()
+              ) : (
+                <div class={input.emptyClass}>
+                  <Mark class="w-14 opacity-10" />
+                  <div class="text-14-regular text-text-weak max-w-56">{language.t(reviewEmptyKey())}</div>
+                </div>
+              )
+            }
+            diffs={reviewDiffs}
+            view={view}
+            diffStyle={input.diffStyle}
+            onDiffStyleChange={input.onDiffStyleChange}
+            onScrollRef={(el) => setTree("reviewScroll", el)}
+            focusedFile={tree.activeDiff}
+            onLineComment={(comment) => addCommentToContext({ ...comment, origin: "review" })}
+            onLineCommentUpdate={updateCommentInContext}
+            onLineCommentDelete={removeCommentFromContext}
+            lineCommentActions={reviewCommentActions()}
+            comments={comments.all()}
+            focusedComment={comments.focus()}
+            onFocusedCommentChange={comments.setFocus}
+            onViewFile={openReviewFile}
+            classes={input.classes}
+          />
+        </Match>
+      </Switch>
+    </Show>
   )
 
   const reviewPanel = () => (