Use stairs above or below when they exist #38244
Merged
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Summary
SUMMARY: None
Purpose of change
Seen in #36833 (comment)
Sometimes when you went down stairs in close proximity, it could move you to a different set of stairs - this is most visible in evac shelter and evac shelter 2, where going down the top left stairs could teleport you to the bottom right stairs.
Describe the solution
To fix this, if there are stairs below or above the stairs you're using, go directly to those instead of searching the map for stairs.
Testing
Go to evac shelter or evac shelter 2, and go down the top left of the 2x2 set of stairs. Before, going down and then up would move you to the bottom right set of stairs. Now, it leaves you on the same stairs.
Additional context
The only place that the weird behavior in #36833 will be seen after this will be when there are non-aligned stairs, which I think should be considered a bug.