Bug: agenda-tag-filter-preset not working, when ":newline" inside a tag radiogroup [9.2.3 (9.2.3-20-g31873e-elpaplus @ /home/msm/.emacs.d/elpa/org-plus-contrib-20190527/)]

Bug: agenda-tag-filter-preset not working, when ":newline" inside a tag radiogroup [9.2.3 (9.2.3-20-g31873e-elpaplus @ /home/msm/.emacs.d/elpa/org-plus-contrib-20190527/)]

[Jens]

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I use the org-agenda-tag-filter-preset in my custom agenda
commands.

This breaks, when there is a (:newline) inside a radiogroup in
org-tag-alist. When calling the agenda command, it gives the error:

"mapcar: Wrong type argument: char-or-string-p, :newline"

and the agenda gets built without the filter-preset.

The minimal configuration (via customize-interface) below, shows the state
triggering the error. Remove the (:newline) from inside the radiogroup in
org-tag-alist and the filter-preset works again.

Please fix it, so the filter-presets can be used together with
(:newline) in tag-radiogroups.

Questions anytime..

Thanks for your effort and great piece of software!
-Jens


Emacs  : GNU Emacs 26.2 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2019-04-12
Package: Org mode version 9.2.3 (9.2.3-20-g31873e-elpaplus @
/home/msm/.emacs.d/elpa/org-plus-contrib-20190527/)

current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
org-src-mode-configure-edit-buffer)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-agenda-files '("~/org-test.org")
 org-tag-alist '((:startgroup) ("domain" . 32) (:grouptags) ("work" . 119)
(:newline) ("private" . 112)
(:endgroup) (:newline) ("other" . 32))
 org-mode-hook '(#[0 "\300\301\302\303\304$\207" [add-hook
change-major-mode-hook org-show-all append local] 5]
#[0 "\300\301\302\303\304$\207"
  [add-hook change-major-mode-hook org-babel-show-result-all append local]
5]
org-babel-result-hide-spec org-babel-hide-all-hashes org-eldoc-load)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-bibtex-headline-format-function #[257 "\300 \236A\207" [:title] 3
"\n\n(fn ENTRY)"]
 org-babel-pre-tangle-hook '(save-buffer)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe
org-babel-header-arg-expand)
 org-src-lang-modes '(("arduino" . arduino) ("redis" . redis) ("php" . php)
("C" . c) ("C++" . c++)
     ("asymptote" . asy) ("bash" . sh) ("beamer" . latex) ("calc" .
fundamental) ("cpp" . c++)
     ("ditaa" . artist) ("dot" . fundamental) ("elisp" . emacs-lisp)
("ocaml" . tuareg)
     ("screen" . shell-script) ("shell" . sh) ("sqlite" . sql))
 org-occur-hook '(org-first-headline-recenter)
 org-cycle-hook '(org-cycle-hide-archived-subtrees
org-cycle-show-empty-lines
 org-optimize-window-after-visibility-change)
 org-speed-command-hook '(org-speed-command-activate
org-babel-speed-command-activate)
 org-confirm-shell-link-function 'yes-or-no-p
 org-link-parameters '(("id" :follow org-id-open) ("eww" :follow eww :store
org-eww-store-link)
      ("rmail" :follow org-rmail-open :store org-rmail-store-link)
      ("mhe" :follow org-mhe-open :store org-mhe-store-link)
      ("irc" :follow org-irc-visit :store org-irc-store-link :export
org-irc-export)
      ("info" :follow org-info-open :export org-info-export :store
org-info-store-link)
      ("gnus" :follow org-gnus-open :store org-gnus-store-link)
      ("docview" :follow org-docview-open :export org-docview-export :store
org-docview-store-link)
      ("bibtex" :follow org-bibtex-open :store org-bibtex-store-link)
      ("bbdb" :follow org-bbdb-open :export org-bbdb-export :complete
org-bbdb-complete-link
:store org-bbdb-store-link)
      ("w3m" :store org-w3m-store-link) ("file+sys") ("file+emacs")
      ("doi" :follow org--open-doi-link) ("elisp" :follow
org--open-elisp-link)
      ("file" :complete org-file-complete-link)
      ("ftp" :follow (lambda (path) (browse-url (concat "ftp:" path))))
      ("help" :follow org--open-help-link)
      ("http" :follow (lambda (path) (browse-url (concat "http:" path))))
      ("https" :follow (lambda (path) (browse-url (concat "https:" path))))
      ("mailto" :follow (lambda (path) (browse-url (concat "mailto:"
path))))
      ("news" :follow (lambda (path) (browse-url (concat "news:" path))))
      ("shell" :follow org--open-shell-link))
 org-agenda-custom-commands '(("n" "Agenda and all TODOs" ((agenda "" nil)
(alltodo "" nil))
      ((org-agenda-tag-filter-preset (quote ("-work")))))
     )
 )

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