Activity相关的侧滑，第一次滑动不够灵敏

在Activity中使用ActivitySlidingBackConsumer时，第一次侧滑返回，手指滑动了半个屏幕，Activity才刚开始向右滑动。如果停留在这个页面，再进行第二次、第三次滑动的话，就比较灵敏了。请问这个有什么解决办法吗？

Start by reproducing the first, second, and third swipe-back gestures in an Activity using ActivitySlidingBackConsumer. Trace the consumer's handling of the initial gesture and compare it with later gestures; done means the first swipe begins responding without requiring roughly half the screen movement.

Written by the indexing model from the issue text.