- _compositeIncremental 中不再 dispose strokeImage,因为 _cache 持有同一引用 - 提前 dispose 导致 syncStrokes/clear/dispose 时 double-dispose(use-after-free) - 单笔画 image 生命周期由缓存统一管理:移除/清除/销毁时释放 - 更新 _rebuildComposite 注释,移除过时说明 审计 ID: 8b-R01
nuanji_app
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