I think it would be useful if you only considered a stair block to be a chair if it had one block of air space directly above it. I can't count on one hand the number of times I've accidentally right clicked on a stair in my wall and started suffocating.

This doesn't allow things like signs on the wall above the chair. Perhaps
check if it's a suffocatable block?
On Wed, Jun 29, 2016 at 8:12 AM Vasco Lavos [email protected]
wrote:

Closed #85 #85 via e5d5d80
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I suggest the player should not sit on stair if he clicked the stair at the back / bottom side (solid side). I always mistakenly right clicked a stair and then it brought me outside my house and sit on the roof.