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UI_E_TIME_BEFORE_LAST_UPDATE
UI_E_TIME_BEFORE_LAST_UPDATE belongs to Windows Animation Manager. It marks the manager was updated with animation time that moved backward. The useful starting point is the exact API, object and state transition that returned 0x802A0109, because a shell or application message can hide that boundary.
First rejecting layer
Windows Animation is a stateful COM subsystem. Animation variables, transitions and storyboards are created under a manager, scheduled against a monotonic animation time, updated before drawing, and eventually sealed or released. A visible glitch can therefore be downstream of a lifecycle, ownership, timeline, callback, or numeric contract failure.
Windows Animation expects nondecreasing time. Mixing wall-clock time, different timer epochs, unit conversions, or stale queued updates can violate monotonicity even when each timestamp is individually valid.
Inspect the animation manager, storyboard, transition, timer, or callback that returned the HRESULT.
Smallest faithful test
- First: Use one animation timer for all updates.
- Next: Discard stale queued ticks by generation and sequence.
- Then: Keep units as UI_ANIMATION_SECONDS end to end.
- Finally: Test suspend/resume and clock-adjustment scenarios.
Diagnostic matrix
- Current and previous update times.
- Timer source and epoch.
- Unit conversion.
- Queue ordering and thread IDs.
What each result would imply
- Fresh storyboard or animation object: a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: keep the timeline, transitions, and manager version fixed.
- Reduced failing operation: If this result follows the reduced step, the rejecting transition is localized. Hold constant: retain current and previous update times and remove only unrelated work.
- Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: use one animation timer for all updates. Hold constant: keep the original sample available for the final regression test.
Limits of the HRESULT
A storyboard keyframe ordering error is internal to one graph; this code concerns the manager’s global update sequence.
Do not replace the timestamp with system wall clock or add epsilon blindly.
Prove the repair
Treat it as corrected only when updates remain monotonic through load, suspend, resume, and delayed-message tests; retain the original negative case so fallback cannot be mistaken for repair.
Technical references
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