mirages problems

[mimo]

since latest commit (r15958) I've seen mirages appearing where they should not: after my troops destroyed an enemy building, when the place of the building goes out of visibility a mirage appears. To reproduced it, here is a saved game. After a few seconds, a barrack mirage will appear where the camera is centered. But as I was testing the AI, I used the charts mods and you should use it also to be able to read the saved game

[Itms]

Fixed that in r15963 :)