fix(graphic/Image):修复图片未加载时获取尺寸不正确的问题#1141
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当图片尚未加载完成时，确保下次能获取到正确的尺寸值。通过在检测到图片未就绪时将 _rect 设为 null，从而触发重新计算。
Ovilia
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Oct 9, 2025
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具体的使用场景是什么样的？getBoundingRect 返回 null 可能是一种未定义的行为，请问哪里的逻辑保证了返回 null 会重新计算？可能更好的解决方案是，在外部使用的时候，判断图片是否完成了加载，而不是在内部做这个修改。
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当图片尚未加载完成时，确保下次能获取到正确的尺寸值。通过在检测到图片未就绪时将 _rect 设为 null，从而触发重新计算。