Before deploying furniture, players need to clear the tile.

[wwkk222208]

Summary

None

Purpose of change

In the current version, players can collect the spilled liquid by placing furniture that can hold it.
For other items, they will be hidden if furniture is placed on them. If this is interpreted as they are pressed under the furniture, then they should probably be damaged, and the stability of the furniture is also questionable.
This is not reasonable
Perhaps more codes can be used to solve this problem, but I think it is unnecessary. We can directly prohibit placing furniture on items. To clear the area and place furniture does not violate our common sense

Describe the solution

Prohibit placing furniture on items.

Describe alternatives you've considered

Testing

This feature is tested in game.

Additional context

[kevingranade]

This pull request has been mentioned on Cataclysm: Dark Days Ahead. There might be relevant details there:

https://discourse.cataclysmdda.org/t/a-frustrating-update/28289/1