fix(core): [CORE-SUBTITLE-OFFSET-01] refresh paused native cue membership and order

packages/artplayer-plugin-multiple-subtitles/ARCHITECTURE.md

@@ -149,9 +149,11 @@ Read native `template.$track.track.cues` for old-core probes: older hosts do not
 provide the later `subtitle.cues` getter. Core5.1.2/5.1.7 only render their first
 active cue; the matrix explicitly records lost simultaneous languages for1.1.0+
 and candidate, while1.0.0's index-merged cue displays both. This remains an open
-compatibility issue, not an approved limitation. Firefox paused offset assertions
-currently fail on old and candidate cores; a WebKit5.3.0 source-switch failure is
-intermittent. See the task05 change and validation JSON for exact failed runs.
+compatibility issue, not an approved limitation. CORE-SUBTITLE-OFFSET-01 corrects
+paused offsets in the candidate core; published Firefox hosts retain their exact
+historical defect observations. WebKit5.3.0/5.4.0 source-switch failures remain
+under task05 investigation. See its change and validation JSON for original failures
+and the independent core offset change for the corrected candidate evidence.
 The matrix is runnable with `yarn test:browser test/browser/multiple-subtitles-combinations.spec.js`;
 do not replace these failures with skips or count boundary observations as acceptance.
 See `../../refactor/baselines/multiple-subtitles-contract.md` for exact historical differences.

packages/artplayer/ARCHITECTURE.md

@@ -670,6 +670,18 @@ transport cancellation, conversion, ownership, native DOM events and cue renderi
 The offset mixin remains the player property entry, with original cue bounds retained
 on native cue objects. Validation evidence and remaining release gates live in refactor/.
 
+timing.ts handles native active-cue invalidation after a paused offset edit. Some
+engines retain the old membership even after cue timestamps change. It compares
+the expected current interval/order to native activeCues and, only on mismatch,
+removes and re-adds the original cue objects in their captured order. The mixin
+then performs the existing update, notice and subtitleOffset emission. It does
+not seek media, replace cues, toggle track mode or allocate background work.
+Playing, disabled and capability-limited hosts retain their existing path. A
+mode-toggle workaround was rejected because Firefox reordered tied cues during
+successive offsets. Tests in subtitle-offset.spec.js verify synchronous native,
+public and rendered membership, identity, order, disabled state and resumed play;
+subtitle-offset-native.spec.js is an independent native video/track probe.
+
 request.ts races work against scope closure. Superseded requests settle undefined even
 when the transport ignores AbortSignal; active failures reject. state.ts owns request
 and track scopes and only generated object URLs. A caller-owned URL is never revoked.

packages/artplayer/dist/artplayer.js

@@ -67,4 +67,4 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
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packages/artplayer/dist/artplayer.legacy.js

@@ -67,4 +67,4 @@
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  * SOFTWARE.
  */
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packages/artplayer/dist/artplayer.mjs

@@ -6180,6 +6180,19 @@ function stateMix(art) {
     }
   });
 }
+function refreshPausedCues(track, video, cues) {
+  if (!track || track.mode === "disabled" || !video?.paused || !Number.isFinite(video.currentTime))
+    return;
+  const time2 = video.currentTime;
+  const expected = cues.filter((cue) => cue.startTime <= time2 && time2 < cue.endTime);
+  const active2 = Array.from(track.activeCues || []);
+  if (expected.length === active2.length && expected.every((cue, index) => active2[index] === cue))
+    return;
+  for (const cue of cues)
+    track.removeCue(cue);
+  for (const cue of cues)
+    track.addCue(cue);
+}
 function subtitleOffsetMix(art) {
   const { notice, i18n, template } = art;
   def(art, "subtitleOffset", {
@@ -6199,6 +6212,7 @@ function subtitleOffsetMix(art) {
         cue.startTime = clamp(cue.originalStartTime + offset, 0, art.duration);
         cue.endTime = clamp(cue.originalEndTime + offset, 0, art.duration);
       }
+      refreshPausedCues(template.$track.track, template.$video, cues);
       art.subtitle.update();
       notice.show = `${i18n.get("Subtitle Offset")}: ${value}s`;
       art.emit("subtitleOffset", value);

packages/artplayer/src/player/subtitleOffsetMix.ts

@@ -1,4 +1,5 @@
 import type { SubtitleOffsetHost } from '../subtitle/types'
+import { refreshPausedCues } from '../subtitle/timing'
 import { clamp, def } from '../utils'
 
 export default function subtitleOffsetMix(art: SubtitleOffsetHost): void {
@@ -21,6 +22,7 @@ export default function subtitleOffsetMix(art: SubtitleOffsetHost): void {
         cue.startTime = clamp(cue.originalStartTime + offset, 0, art.duration)
         cue.endTime = clamp(cue.originalEndTime + offset, 0, art.duration)
       }
+      refreshPausedCues(template.$track.track, template.$video, cues)
       art.subtitle.update()
       notice.show = `${i18n.get('Subtitle Offset')}: ${value}s`
       art.emit('subtitleOffset', value)

packages/artplayer/src/subtitle/timing.ts

@@ -0,0 +1,16 @@
+import type { SubtitleCue } from './types'
+
+export function refreshPausedCues(track: TextTrack | undefined, video: { paused?: boolean, currentTime?: number } | undefined, cues: readonly SubtitleCue[]): void {
+  if (!track || track.mode === 'disabled' || !video?.paused || !Number.isFinite(video.currentTime))
+    return
+  const time = video.currentTime!
+  const expected = cues.filter(cue => cue.startTime <= time && time < cue.endTime)
+  const active = Array.from(track.activeCues || [])
+  if (expected.length === active.length && expected.every((cue, index) => active[index] === cue))
+    return
+  // Some engines retain stale active flags after timing edits while paused.
+  for (const cue of cues)
+    track.removeCue(cue)
+  for (const cue of cues)
+    track.addCue(cue)
+}

packages/artplayer/src/subtitle/types.ts

@@ -36,7 +36,7 @@ export interface SubtitleView {
 }
 
 export interface SubtitleOffsetHost {
-  template: { $track?: SubtitleTrack | null }
+  template: { $track?: SubtitleTrack | null, $video?: { paused?: boolean, currentTime?: number } }
   subtitle: { readonly cues: SubtitleCue[], update: () => void }
   readonly duration: number
   notice: NoticeSink