[JW Lua] Changing independent key signatures crashes Finale

[Jan Angermüller]

Jari,

I have two issues with changing the key signature on an FCCell object 
with Finale 2014d/Windows7/JW Lua 0.29.

1.) If "Independent Element -> Key Signature" is NOT selected in the 
staff settings,
the following code *may crash *Finale. It "may crash", as sometimes I 
have to run the script several times until it crashes, so there must be 
some undefined behaviour.
Maybe this is by design and the developer has to make sure that it is a 
staff with an independent key signature before calling 
FCCell:GetKeySignature(). But it would be more safe if you inserted a 
quick check into the FCCell:GetKeySignature()-implementation.
I would expect cell:GetKeySignature() to return nil on a non-independent 
key signature staff.
That's better than crashing ;-)
BTW, you have FCCell.HasIndependentTimeSig(). Maybe you could also add 
HasIndependentKeySig().

This is the test code:

--change key signature on first selected measure of first selected staff
if not finenv.Region():IsEmpty() then
     local 
cell=finale.FCCell(finenv.Region().StartMeasure,finenv.Region().StartStaff)
     key=cell:GetKeySignature()
     if key ~= nil then
        print("Old alteration:", key.Alteration)
        key:SetMajorKey(5)
        print("New alteration:", key.Alteration)
        key:Save()   --I don't know if this is necessary: same behaviour 
if I keep it in or take it out
        cell:Save()    --this function call crashes Finale
     end
end

2.) Now if "Independent Element -> Key Signature" IS selected in the 
staff settings and I also add a condition to check that key signatures 
are independent, the code above has the same behaviour: it still doesn't 
change any key signatures, but crashes Finale (if not after the first 
run, then after running it several times).
This is the test code:

--change key signature on first selected measure of first selected staff
--with independent key signature check
if not finenv.Region():IsEmpty() then
     local staff=finale.FCStaff()
     staff:Load(finenv.Region().StartStaff)
     if staff.IndependentKeySig then
        local 
cell=finale.FCCell(finenv.Region().StartMeasure,finenv.Region().StartStaff)
        key=cell:GetKeySignature()
        if key ~= nil then
           print("Old alteration:", key.Alteration)
           key:SetMajorKey(5)
           print("New alteration:", key.Alteration)
           key:Save()   --I don't know if this is necessary: same 
behaviour if I keep it in or take it out
          cell:Save()    --this function call crashes Finale
        end
     end
end

What works fine is changing the global key sig using 
FCMeasure:GetKeySignature(), i.e something like:
local measure=finale.FCMeasure()
measure:Load(1)
local key=measure:GetKeySignature()
key:SetMajorKey(5)  --change key sig in measure 1
measure:Save()

Any ideas what the independent key sig thingy comes from ?

Best regards,
Jan
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