Dirk Hohndel 1a3ea5636a Don't change gas used in segments if there is still a cylinder with that gas
Otherwise adding a second cylinder (to the default one cylinder of air)
and subsequently changing the gas of that cylinder will illogically change
the gas used in all the segments.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2013-11-13 21:56:51 +09:00
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