fix: More than two touches at once disorder some 3rd-party packages #642
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问题描述
UIToolkit（可能包括其他第三方库）使用三指及以上触碰后，事件系统变得错乱。表现为：无法再响应滑动事件等。
问题分析
多指（>2）操作时，最后的eventType为
touchcancel，并且changedTouches中未包含全部touch，导致C#层识别不到触碰点消失。解决方案
此PR的方法是：cancel事件dispatch之前，先dispatch所有touch的
touchend事件