[Freeciv-Dev] (PR#6596) Negative green % via /set rivers 1000 prior to game start

["Guest" <rt-guest@xxxxxxxxxxxxxx>]

On freeciv 1.14.0 client.

If I join a civserver at freeciv.org, and /set rivers 1000 several 
times, this allows
the settings for grass or mountains to fall under the minimum value of 
10.

If I keep doing /set rivers 1000 repeatedly, after around 3-5 times the 
amount of grass becomes negative.

I did not attempt to start the game with this condition.  I went back 
and tried to reproduce it and didn't see it happen a second or third 
time.  I'm not sure if the server I connected to was a regular 1.14.0 
or -beta1 or -beta2.