fly command no checking permission after map change.

CMDBOOK-2269 - Reported by RustyDagger

The title pretty much explains it, Currently if you enable fly in a map where you have permission then change map to where you don't have permission you can still fly. surly bukkit provides some way to detect a map change and acting on that would only be trivial. I am sure there are many server owners that would much like to have /fly usable on a player level much like I would. its nice to have on a building map but exploitable on a pvp level.

if the above cant be done can some kind of non toggle command be added to allow me to force it off using a command block currently i can only run /fly on a player and that could either turn it off or on.. maybe /fly name off

首先复现报告中的操作序列：在玩家拥有权限的地图上启用 /fly，然后切换到玩家没有权限的地图。检查与 Bukkit 相关的命令处理和地图切换处理，并在权限变更后不再保留飞行状态，或所请求的明确关闭行为已被清晰定义并经过测试时，认为该报告已完成。

由索引模型根据 Issue 内容生成。