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Hi,
That option is supposed to define some vertical extra gap between letter groups in acronyms (which I would like), and probably other 'sorted' glossaries.
However activating or deactivating that option in my MWE has no effect at all whatsoever. I suspect it is because I defined 'manually' my ...

I am writing a thesis using the book class and thanks to the glossaries package with the alttree style, I can have a list of symbols grouped in different categories

Since I am using "option 2", that is using makeindex with \makeglossaries and \printglossaries I had to resort to create different ...