fix(desktop): reset social timeline on view change

apps/desktop/layer/renderer/src/modules/entry-column/index.tsx

@@ -35,7 +35,10 @@ import { useNavigateFirstEntry } from "./hooks/useNavigateFirstEntry"
 import { EntryListHeader } from "./layouts/EntryListHeader"
 import { EntryEmptyList, EntryList } from "./list"
 import { shouldScrollTimelineToTopOnRefreshStateChange } from "./refresh-reset"
-import { shouldSuspendMarkReadForScrollReset } from "./scroll-reset"
+import {
+  shouldResetScrollOnTimelineIdentityChange,
+  shouldSuspendMarkReadForScrollReset,
+} from "./scroll-reset"
 import { EntryRootStateContext } from "./store/EntryColumnContext"
 
 function EntryColumnContent() {
@@ -126,9 +129,22 @@ function EntryColumnContent() {
     timelineIdentity,
   )
 
+  const previousTimelineIdentityRef = useRef<string>(undefined)
   useLayoutEffect(() => {
+    const previousTimelineIdentity = previousTimelineIdentityRef.current
+    previousTimelineIdentityRef.current = timelineIdentity
+
     resetScrollInteractionState()
-  }, [resetScrollInteractionState, timelineIdentity])
+    if (
+      shouldResetScrollOnTimelineIdentityChange({
+        enabled: view === FeedViewType.SocialMedia,
+        previousTimelineIdentity,
+        timelineIdentity,
+      })
+    ) {
+      scrollTimelineToTop()
+    }
+  }, [resetScrollInteractionState, scrollTimelineToTop, timelineIdentity, view])
 
   const wasRefreshingRef = useRef(isRefreshing)
   useEffect(() => {

apps/desktop/layer/renderer/src/modules/entry-column/scroll-reset.test.ts

@@ -3,6 +3,7 @@ import { describe, expect, test } from "vitest"
 import {
   getInitialScrollOffset,
   shouldApplyScrollResetSignal,
+  shouldResetScrollOnTimelineIdentityChange,
   shouldSuspendMarkReadForScrollReset,
 } from "./scroll-reset"
 
@@ -56,4 +57,38 @@ describe("shouldApplyScrollResetSignal", () => {
       }),
     ).toBe(false)
   })
+
+  test("resets scroll for enabled timeline identity changes after initial mount", () => {
+    expect(
+      shouldResetScrollOnTimelineIdentityChange({
+        enabled: true,
+        previousTimelineIdentity: undefined,
+        timelineIdentity: "6:",
+      }),
+    ).toBe(false)
+
+    expect(
+      shouldResetScrollOnTimelineIdentityChange({
+        enabled: true,
+        previousTimelineIdentity: "0:",
+        timelineIdentity: "6:",
+      }),
+    ).toBe(true)
+
+    expect(
+      shouldResetScrollOnTimelineIdentityChange({
+        enabled: false,
+        previousTimelineIdentity: "0:",
+        timelineIdentity: "6:",
+      }),
+    ).toBe(false)
+
+    expect(
+      shouldResetScrollOnTimelineIdentityChange({
+        enabled: true,
+        previousTimelineIdentity: "6:",
+        timelineIdentity: "6:",
+      }),
+    ).toBe(false)
+  })
 })

apps/desktop/layer/renderer/src/modules/entry-column/scroll-reset.ts

@@ -23,3 +23,14 @@ export const getInitialScrollOffset = ({
   })
     ? 0
     : (cachedOffset ?? 0)
+
+export const shouldResetScrollOnTimelineIdentityChange = ({
+  enabled,
+  previousTimelineIdentity,
+  timelineIdentity,
+}: {
+  enabled: boolean
+  previousTimelineIdentity?: string
+  timelineIdentity: string
+}) =>
+  enabled && previousTimelineIdentity !== undefined && previousTimelineIdentity !== timelineIdentity