Cataclysm-dda: Triffid queens can remove stairs to their nest.

[CoroNaut]

Describe the bug
Triffid queens have the ability to change nature at their will, but also allows them to remove the entrance to the underground system they produce.

To Reproduce
Steps to reproduce the behavior:

1. Find a triffid grove
2. Allow triffid queen to pass over top their nest.

Expected behavior
I could imagine there are bushes over top the entrance, but when the triffid queen passes overhead, the underground entrance should not be covered with trees and inaccessible.

Versions and configuration(please complete the following information):

• OS: Windows 7
• Game Version 0.C-30421-gf615e24
• Graphics version tiles
• Mods loaded none

[tyrael93]

Due to old whalescode, since stairs and trees are both terrain, cutting the tree will leave an empty dirt square where your stairs used to be, blocking the entrance to ( or escape in some cases) to a lower or upper level.
I personally use a personal mod/patch that among other things removes a queen's "treewake"because of how broken it is.
Let's also not forget that driving a car around a triffid queen means your car will be literally stuck inside several trees that you won't be able to cut (since they occupy the same tile as the inside of your car) and will prevent it from moving. This also works with tanks. Flower power, am I right? 😂