[JW Lua] TextExpressionDef in Use?

[Jan Angermüller]

>
> I am searching through the archive and the documentation and testing a 
> lot, but sofar I didn't find anything that allows me to check, whether 
> a textExpressiondefintion (or shape...) is in use or not.
AFAIK there is no direct check/flag available, you need to browse 
through all FCExpressions to check if an textexpressiondef was used.
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