fix(studio): keep layer selection seek within clip range

packages/studio/src/components/editor/LayersPanel.tsx

@@ -8,7 +8,10 @@ import {
 import { useStudioContext } from "../../contexts/StudioContext";
 import { useDomEditContext } from "../../contexts/DomEditContext";
 import { usePlayerStore } from "../../player";
-import { findMatchingTimelineElementId } from "../../utils/studioHelpers";
+import {
+  findMatchingTimelineElementId,
+  resolveTimelineSelectionSeekTime,
+} from "../../utils/studioHelpers";
 import { Layers } from "../../icons/SystemIcons";
 
 const TAG_ICONS: Record<string, string> = {
@@ -49,8 +52,14 @@ interface CollapsedState {
 }
 
 export const LayersPanel = memo(function LayersPanel() {
-  const { previewIframeRef, activeCompPath, refreshKey, compositionLoading, timelineElements } =
-    useStudioContext();
+  const {
+    previewIframeRef,
+    activeCompPath,
+    refreshKey,
+    compositionLoading,
+    timelineElements,
+    currentTime,
+  } = useStudioContext();
   const { domEditSelection, applyDomSelection, updateDomEditHoverSelection } = useDomEditContext();
 
   const [layers, setLayers] = useState<DomEditLayerItem[]>([]);
@@ -140,11 +149,12 @@ export const LayersPanel = memo(function LayersPanel() {
       if (matchedId) {
         const el = timelineElements.find((e) => (e.key ?? e.id) === matchedId);
         if (el) {
-          usePlayerStore.getState().requestSeek(el.start + el.duration / 2);
+          const nextTime = resolveTimelineSelectionSeekTime(currentTime, el);
+          if (nextTime != null) usePlayerStore.getState().requestSeek(nextTime);
         }
       }
     },
-    [resolveSelection, timelineElements],
+    [currentTime, resolveSelection, timelineElements],
   );
 
   const handleSelectLayer = useCallback(

packages/studio/src/utils/studioHelpers.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+import { resolveTimelineSelectionSeekTime } from "./studioHelpers";
+
+describe("resolveTimelineSelectionSeekTime", () => {
+  it("keeps the current time when it is already inside the clip range", () => {
+    expect(resolveTimelineSelectionSeekTime(3, { start: 0, duration: 5 })).toBe(3);
+  });
+
+  it("clamps to the clip start when current time is before the clip", () => {
+    expect(resolveTimelineSelectionSeekTime(1, { start: 4, duration: 3 })).toBe(4);
+  });
+
+  it("clamps to the clip end when current time is after the clip", () => {
+    expect(resolveTimelineSelectionSeekTime(10, { start: 4, duration: 3 })).toBe(7);
+  });
+
+  it("falls back to the clip start for invalid current time", () => {
+    expect(resolveTimelineSelectionSeekTime(Number.NaN, { start: 2, duration: 5 })).toBe(2);
+  });
+});

packages/studio/src/utils/studioHelpers.ts

@@ -158,6 +158,20 @@ export function findMatchingTimelineElementId(
   return null;
 }
 
+export function resolveTimelineSelectionSeekTime(
+  currentTime: number,
+  element: Pick<TimelineElement, "start" | "duration"> | null | undefined,
+): number | null {
+  if (!element) return null;
+  if (!Number.isFinite(element.start) || !Number.isFinite(element.duration)) return null;
+
+  const start = Math.max(0, element.start);
+  const end = Math.max(start, start + Math.max(0, element.duration));
+  const time = Number.isFinite(currentTime) ? currentTime : start;
+
+  return clampNumber(time, start, end);
+}
+
 export function clampNumber(value: number, min: number, max: number): number {
   if (max < min) return min;
   return Math.min(Math.max(value, min), max);