触摸板滑动优化

在支持多点触控的电脑上，使用双指在触控板上进行滑动时会出现bug，导致控件乱选择和位移，希望优化对双指滑动的支持——当使用双指在触摸板上滑动时，自由滚动画布

On computers that support multi-touch, there will be bugs when using two fingers to slide on the touchpad, causing the controls to be randomly selected and shifted, hoping to optimize the support for two-finger sliding - when using two fingers on the touchpad Free scrolling canvas when sliding