tweaks

test/stage-autoplay.test.js

@@ -48,3 +48,19 @@ test('manual playback stops do not advance and unload restores playback', () =>
   const wrapper = h.Timeline.loop; h.api.removeStageAutoplay();
   assert.notEqual(h.Timeline.loop, wrapper);
 });
+
+test('autoplay overrides global looping for once stages and restores it even on failure', () => {
+  const h = harness(); h.api.removeStageAutoplay();
+  h.BarItems = { looped_animation_playback: { value: true } };
+  h.Timeline.loop = function() { if (!h.BarItems.looped_animation_playback.value) this.playing = false; };
+  const first = h.clip('example.p1'), next = h.clip('example.p2');
+  h.Animation.selected = first; h.Animation.all = [first, next];
+  h.api.installStageAutoplay(); h.Timeline.loop();
+  assert.equal(h.Animation.selected, next);
+  assert.equal(h.BarItems.looped_animation_playback.value, true);
+  h.api.removeStageAutoplay();
+  h.Timeline.loop = () => { throw new Error('preview failed'); };
+  h.api.installStageAutoplay();
+  assert.throws(() => h.Timeline.loop(), /preview failed/);
+  assert.equal(h.BarItems.looped_animation_playback.value, true);
+});