configure indentation width instead? (was: Re: [PATCH 2/2] Emacs: Add variable to toggle thread indentation to notmuch-show)

[Gregor Zattler]

Hi Felix, notmuch develpers,

Felix introduces a boolean configuration variable in order to
disable/enable indentation.   Wouldn't it be more helpful and
powerful to customise the indentation width with "0" meaning no
indentation, "1" being the current behaviour, "2" meaning double
indentation, "3" threefold indentation ...  ?

Just my 2 Euro-cents, Gregor