You can create a new Custom Field that when an issue changes from 'Bug' to 'New Featura' put a value in custom field (ex. 'Yes') (you can do these with custom listener).
So, you'll have more easy to make the condition of groovy, because you've only have to check on the condition if the custom field is set to 'yes'.
Hope it helps.
what is mean by previous issue type was bug and current issuetype is "New Feature" ?
do you mean issue created as bug and later moved to new feature?
or assumen current issue is TEST-12 bug and prvious issue is TEST-11 new feature, is it like this?
i am not getting exactly what do you want achive!!
can you explain little bit more about your requirement.
check this it may help you
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