Bug 提醒：对预测性返回手势会造成 Bug 【耗费两天才排除出来】

表现形式是：

第一次右滑时无法返回到桌面，需要连续右滑两次才能返回桌面。

【因为测试设备有限，且是 ipad 应用，导致排查两天才定位到问题，大家引以为戒】

运行 Log 排查如下：
会有事件，但是一直是 rootView 拦截，且 Activity 的 返回事件（及适配手势返回回调）都不会响应。

title = com.vivaia.pos/com.app.template.LaunchActivity enqueue motion: MotionEvent { action=ACTION_DOWN, actionButton=0, id[0]=0, x[0]=0.0, y[0]=1082.041, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, classification=NONE, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=2345127342, downTime=2345127342, deviceId=6, source=0x1002, displayId=0, eventId=835972846 }
title = com.vivaia.pos/com.app.template.LaunchActivity enqueue motion: MotionEvent { action=ACTION_UP, actionButton=0, id[0]=0, x[0]=448.28516, y[0]=1271.5312, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, classification=NONE, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=2345127492, downTime=2345127342, deviceId=6, source=0x1002, displayId=0, eventId=290760247 }
on fling

Start by reproducing the first and second right-swipe on the iPad application and inspect the LaunchActivity motion-event path described in the log. Check why the rootView intercepts the first gesture and whether the Activity back or gesture callback receives it; done means one right-swipe returns to the desktop.