Of course that's not true at all. What if the previous supply was just right, and then doesn't keep up with growth. That would result in deflation as well.
A free market in money would adapt to changes in its supply
Right. By dropping prices, reducing employment and reducing production. Increased defaults, reduced borrowing and less new business creation.
No! What you say is "not true at all".
The only "just right" supply of money is that which the free market determines is "just right". The government cannot determine it for us.
If you believe it can, then you must examine your premises. They seem to land heavily on the planned-economy side.