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/usr/share/vim/addons/syntax/notmuch-folders.vim is in notmuch-vim 0.21-3ubuntu2.

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" notmuch folders mode syntax file

syntax region nmFoldersCount     start='^' end='\%10v'
syntax region nmFoldersName      start='\%11v' end='\%31v'
syntax match  nmFoldersSearch    /([^()]\+)$/

highlight link nmFoldersCount     Statement
highlight link nmFoldersName      Type
highlight link nmFoldersSearch    String

highlight CursorLine term=reverse cterm=reverse gui=reverse