Summary: Transform to water
                 Project: Freeciv
            Submitted by: jtn
            Submitted on: Wed Aug  8 22:44:09 2012
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None
         Planned Release: 2.5.0



Currently for land-to-water transformations, as with others, you have to
specify a specific transform_result terrain. This means you can't arrange that
expanding a lake gets you more lake whereas receding a coastline gets you more

Prior to patch #3478 this simply led to discontinuities in water type. Now it
means that any attempt to expand a lake turns the whole thing to Ocean, via
flooding, even if it's still inland.

What you really want is some way of expressing in the ruleset that you want to
transform to an appropriate kind of water, with the exact transformation
depending on the surroundings.

Details to work out:
* How to express this in ruleset?
** transform_result="Water" (potentially clashing with existing terrain name
in modpacks)?
** just trigger the selection behaviour on any land-to-water transformation,
ignoring the precise transform_to terrain? (Other special behaviour is already
triggered, such as checking for sufficient surrounding water tiles.)
* What to do if multiple "water" types surround tile?
** Obviously in cases where flooding happens, then the flooding type wins.
** Use most_shallow_ocean()?
** Perhaps we want to define a partial order on ocean terrains showing which
wins over and/or floods which, replacing the current fixed one of


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