Returns next fully available default style name. This is used when creating new styles with a default name, where an index increments for additional styles created.
Names are in the form: MyStyleNormal[index] and MyStyleSelected[index], eg MyStyleNormal10. Returns a name that will be valid for both the normal style and the selected style.
No arguments
Return type: string
Next available style name that is not being used elsewhere, which can be used to create Normal and Selected variants of it.
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