This is not a new bug. It has been there for a long time, but I am
only just now getting around to reporting it. I am also proposing a
fix below.

How to reproduce:

Open up a Org mode file and add the following item to it:

 1. Now is the time for all good men and women to 
[[id:269cedb3-9a50-4de9-9696-f8297c18a75a][come to the aid of their KEG PARTY]]

Ensure you have run `org-toggle-link-display' to show the "descriptive
display" of links, not the literal display that might show up in your
email view of the above line (e.g., the
"[id:269cedb3-9a50-4de9-9696-f8297c18a75a]" part will not show up in the
"descriptive" link display mode).

Move point to the "a" in "aid", and type C-x f (set-fill-column) to
set the fill column to 62.

Place point anywhere inside the above line after the "1. " (e.g. at
the "g" in "good").

Type M-x org-fill-paragraph.

The result is

 1. Now is the time for all good men and women to 
[[id:269cedb3-9a50-4de9-9696-f8297c18a75a][come to the
    aid of their KEG PARTY]]

Not only is the above result visually jarring (see
https://i.imgur.com/HnY70le.png for an annotated screenshot) when in
"descriptive link" display mode, it also breaks `org-return', as

Move the point to the "g" in "good" in the line above.  Type M-x
org-next-link to got to that first link, then type M-x org-return. The
result is an insertion of a newline, resulting in:

 1. Now is the time for all good men and women to 
[[id:269cedb3-9a50-4de9-9696-f8297c18a75a][come to the aid of
    their KEG PARTY]]

when I expect it to navigate to the heading upon which is associated
with "id:269cedb3-9a50-4de9-9696-f8297c18a75a".

Here is my proposed fix:

First, it may be a separate "bug" that org-return cannot recognize the
multi-line Org link. I don't know one way or the other for that, but
instead I am arguing that org mode's fill paragraph function should
never break the line right in the middle of the link. Instead the
whole link should be treated as a word.  To illustrate the fix, I have
appended my own function to `fill-nobreak-predicate' to prevent the
breakages, but taking hints from `org-setup-filling' which does
similar things for other areas of Org mode buffers:

(defun bg-org-fill-paragraph-with-link-nobreak-p ()
  "Do not allow `fill-paragraph' to break inside the middle of Org mode links."
  (and (assq :link (org-context)) t))

(defun bg-org-fill-paragraph-config ()
  "Configure `fill-paragraph' for Org mode."
  ;; Append a function to fill-nobreak-predicate similarly to how org-mode does
  ;; inside `org-setup-filling':
  (when (boundp 'fill-nobreak-predicate)
      (append fill-nobreak-predicate

And then run bg-org-fill-paragraph-config from my `org-mode-hook'

The fix I propose is to change `org-setup-filling' to do the above.


Emacs  : GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
 of 2017-09-22, modified by Debian
Package: Org mode version 9.1.9 (release_9.1.9-580-g39837b @ 

current state:
 org-id-locations-file "/home/drunkard/Plans/Home/.org-id-locations"
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe 
 outline-minor-mode-hook '(wikipedia-outline-magic-keys (lambda nil (require 
(quote outline-magic))))
 org-clock-persist-file "/home/drunkard/Plans/Home/org-clock-save.el"
 org-speed-command-hook '(org-speed-command-activate 
 org-occur-hook '(org-first-headline-recenter)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-html-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"]
 org-confirm-shell-link-function 'yes-or-no-p
 org-id-link-to-org-use-id t
 org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default
 org-clock-idle-time 10
 org-startup-folded nil
 org-file-apps '((auto-mode . emacs) ("\\.mm\\'" . default) ("\\.x?html?\\'" 
browse-url-of-file (expand-file-name file))
                 ("\\.pdf\\'" . default))
 org-tab-before-tab-emulation-hook '(org-tempo-complete-tag)
 org-export-with-sub-superscripts nil
 org-return-follows-link t
 org-latex-format-headline-function 'org-latex-format-headline-default-function
 org-default-notes-file "/home/drunkard/Plans/Home/notes.org"
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-latex-format-drawer-function #[514 "\207" [] 3 "\n\n(fn _ CONTENTS)"]
 org-odt-format-headline-function 'org-odt-format-headline-default-function
 org-src-mode-hook '(org-src-babel-configure-edit-buffer 
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-babel-pre-tangle-hook '(save-buffer)
 org-html-head-include-default-style nil
 org-mode-hook '(org-tempo-setup org-clock-load bg-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-refile-targets '((nil :maxlevel . 9) (org-agenda-files :maxlevel . 9))
 org-bibtex-headline-format-function #[257 "\300\236A\207" [:title] 3 "\n\n(fn 
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-ascii-format-drawer-function #[771 "\207" [] 4 "\n\n(fn NAME CONTENTS 
 org-odt-format-inlinetask-function 'org-odt-format-inlinetask-default-function
 org-clock-persist t
 org-refile-use-outline-path 'file
 org-directory "/home/drunkard/Plans/Home"
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-show-empty-lines 
 org-plantuml-jar-path "/home/drunkard/plantuml/plantuml.jar"
 org-edit-src-auto-save-idle-delay 5
 org-todo-keywords '((sequence "TODO(t)" "|" "DONE(d)" "SHELVED(s)" 
 org-babel-tangle-lang-exts '(("python" . "py") ("emacs-lisp" . "el") ("elisp" 
. "el"))
 org-confirm-elisp-link-function 'bg-org-confirm-elisp-link
 org-html-htmlize-output-type 'css
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 outline-mode-hook '((lambda nil (require (quote outline-magic))))
 org-odt-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"]
 org-babel-after-execute-hook '(bg-org-babel-after-execute-hook)
 org-html-format-headline-function 'org-html-format-headline-default-function
 org-link-parameters '(("rmail" :follow org-rmail-open :store 
                       ("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 
                       ("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) ("id" :follow 
org-id-open) ("file+sys") ("file+emacs")
                       ("doi" :follow org--open-doi-link) ("elisp" :follow 
                       ("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-babel-load-languages '((emacs-lisp . t) (python . t) (shell . t) (sqlite . 
t) (dot . t) (plantuml . t))
 org-clock-in-hook '(bg-org-clock-in-hook)
 org-agenda-files "/home/drunkard/Plans/Home/org-agenda-files-list-file.txt"
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-confirm-babel-evaluate 'bg-org-confirm-babel-evaluate
 org-export-headline-levels 100
 org-publish-project-alist '(("my-emacs-lisp-org" :base-directory 
"~/emacs_lisp/" :publishing-directory "~/public_html/emacs_lisp"
                              :recursive t :table-of-contents t :base-extension 
"org" :publishing-function org-html-publish-to-html
                              :style-include-default nil :section-numbers t 
:with-sub-superscript nil :html-head
                              "<link rel=\"stylesheet\" href=\"org.css\" 
type=\"text/css\" />" :author-info nil :creator-info nil)
                             ("my-emacs-lisp-extra" :base-directory 
"~/emacs_lisp/" :publishing-directory "~/public_html/emacs_lisp"
                              :base-extension "css\\|pdf\\|png\\|jpg\\|gif" 
:publishing-function org-publish-attachment :recursive t
                              :author nil)
                             ("my-emacs-lisp" :components ("my-emacs-lisp-org" 

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