Bug: org-backward-paragraph give an error when called from the #+BEGIN_SRC line of a source block [9.1.1 (9.1.1-17-g24ea1b-elpaplus @ /home/omar/.emacs.d/elpa/org-plus-contrib-20171002/)]

[Omar Antolin <omar.antolin@gmail.com>]

If you run `org-backward-paragraph` from the `#+BEGIN_SRC` line of a
source block it gives the error message "Invalid search bound (wrong
side of point)", instead of moving point.

I tried tracking it down and this error message comes from a call to
`re-search-backward` in the source for `org-backward-paragraph`:

#+BEGIN_SRC emacs-lisp
(when (re-search-backward "^[ \t]*$" contents-begin 'move)
  (skip-chars-forward " \r\t\n" origin)
  (if (= (point) origin) (goto-char contents-begin)
    (beginning-of-line)))
#+END_SRC

This excerpt is from inside a branch of a `cond` that tests for
`(memq type '(src-block verse-block))`. I don't really understand what
the code is trying to do or why the case of source blocks and verse
block should be handled together.

Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.  You don't know how to make a good report?  See

     http://orgmode.org/manual/Feedback.html#Feedback

Your bug report will be posted to the Org-mode mailing list.
------------------------------------------------------------------------



Emacs  : GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2017-09-20 on lcy01-07, modified by Debian
Package: Org-mode version 8.2.10 (release_8.2.10 @ /usr/share/emacs/24.5/lisp/org/)

current state:
==============
(setq
 org-tab-first-hook '(org-hide-block-toggle-maybe
		      org-src-native-tab-command-maybe
		      org-babel-hide-result-toggle-maybe
		      org-babel-header-arg-expand)
 org-speed-command-hook '(org-speed-command-default-hook
			  org-babel-speed-command-hook)
 org-occur-hook '(org-first-headline-recenter)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-confirm-shell-link-function 'yes-or-no-p
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
		     org-src-mode-configure-edit-buffer)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-babel-pre-tangle-hook '(save-buffer)
 org-mode-hook '(#[nil "\300\301\302\303\304$\207"
		   [org-add-hook change-major-mode-hook org-show-block-all
		    append local]
		   5]
		 #[nil "\300\301\302\303\304$\207"
		   [org-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-ctrl-c-ctrl-c-hook '(org-babel-hash-at-point
			  org-babel-execute-safely-maybe)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
		  org-cycle-hide-inline-tasks org-cycle-show-empty-lines
		  org-optimize-window-after-visibility-change)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 )