mlschroe left a comment (rpm-software-management/rpm#3663)
I find the use case of trimming every line in the argument somewhat exotic.
Having said this, I think you can do that already with the current rpm version:
```
%multiline_trim() %{lua:return
(arg[1]:gsub('^%s',''):gsub("\\n%s*","\\n"):gsub("%s*\\n","\\n"):gsub('%s*$',''))}
```
Maybe there's an easier way to do it, I'm not a lua expert.
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