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contains the same information.
(declare-function notmuch-select-tag-with-completion "notmuch" (prompt &rest search-terms))
(declare-function notmuch-search-show-thread "notmuch" nil)
-(defcustom notmuch-show-headers '("Subject" "To" "Cc" "From" "Date")
+(defcustom notmuch-show-headers '("Subject" "To" "Cc" "Date")
"Headers that should be shown in a message, in this order.
For an open message, all of these headers will be made visible