Invalid AABB inAABB UnityEngine.Canvas Solution to: sendwillrendercanvases()

Today, I wrote such a Bug. It’s amazing that where the code went wrong, it didn’t get in. It’s been a long time since we found out that the reason for bug is that when dividing the division, the divisor is 0. So when the next old fellow is confronted with such a situation, we can find out whether the divisor is 0 when doing division operations.