[BUG] Org export to latex/pdf with longtabu adds extra line (\\) when #+NAME is present but no #+CAPTION [9.8-pre (release_9.7.11-145-g28b631 @ /home/aurel/admin/org-bugreport/org/lisp/)]

[BUG] Org export to latex/pdf with longtabu adds extra line (\\) when #+NAME is present but no #+CAPTION [9.8-pre (release_9.7.11-145-g28b631 @ /home/aurel/admin/org-bugreport/org/lisp/)]

[Aurélien Francillon]

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Hi,

when exporting org table to latex/pdf with longtabu environment the
generated latex includes extra \\ if the #+NAME tag is present,
inserting an needed row, the resulting table look ugly in some cases.

This table export correctly:

#+ATTR_LATEX: :environment longtabu :align {|l|l|}
| 100 | test |

Generated tex:

\begin{longtabu}{{|l|l|}}
100 & test\\
\end{longtabu}

This table does not:

#+ATTR_LATEX: :environment longtabu  :align {|l|l|}
#+NAME: 1
| 100 | test |

Generated tex:

\begin{longtabu}{{|l|l|}}
\label{tab:orgfed8bde}
\\
100 & test\\
\end{longtabu}

The extra \\ is inserting a new row and because of the ":align {|l|l|}"
it actually looks ugly with extra vertiocal bars on top of the table

Note that when both #+NAME and #+CAPTIONS are present the extra \\ is
not causing an issue.

#+CAPTION: Test caption
#+NAME: 222
#+ATTR_LATEX: :environment longtabu :align {|l|l|}
| 100 | test |

Generated tex:
\begin{longtabu}{{|l|l|}}
\caption{\label{tab:org6e51105}Test caption}
\\
100 & test\\
\end{longtabu}

The problem also does not appear with tabu environment.

The extra \\ seem to be added at ox-latex.el line 3937 (current git head):

	(concat (and fontsize (concat "{" fontsize))
		(format "\\begin{%s}%s{%s}\n" table-env width alignment)
		(and above?
		     (org-string-nw-p caption)
		     (concat caption "\\\\\n")) ; <= HERE 
		contents
		(and (not above?)
		     (org-string-nw-p caption)
		     (concat caption "\\\\\n"))
		(format "\\end{%s}" table-env)
		(and fontsize "}"))))

When I remove the "\\\\" the generated code is correct, but I suspect
this is may be useful in some other cases and this may not be a suitable
fix?

Best,
Aurélien 

Emacs  : GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.43, cairo version 1.18.0)
Package: Org mode version 9.8-pre (release_9.7.11-145-g28b631 @ /home/aurel/admin/org-bugreport/org/lisp/)

current state:
==============
(setq
 org-link-elisp-confirm-function 'yes-or-no-p
 org-bibtex-headline-format-function 'org-bibtex-headline-format-default
 org-persist-after-read-hook '(org-element--cache-persist-after-read)
 org-export-before-parsing-hook '(org-attach-expand-links)
 org-cycle-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-odt-format-inlinetask-function 'org-odt-format-inlinetask-default-function
 org-ascii-format-drawer-function '(closure (t) (_name contents _width) contents)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-show-empty-lines
		  org-cycle-optimize-window-after-visibility-change org-cycle-display-inline-images)
 org-persist-before-read-hook '(org-element--cache-persist-before-read)
 org-yank-image-file-name-function 'org-yank-image-autogen-filename
 org-mode-hook '((closure
		  (org--rds reftex-docstruct-symbol org-attach-method org--single-lines-list-is-paragraph
		   org-element-greater-elements org-agenda-restrict-end org-agenda-restrict-begin
		   org-agenda-restrict visual-fill-column-width org-clock-history org-agenda-current-date
		   org-with-time org-defdecode org-def org-read-date-inactive org-ans2 org-ans1
		   org-columns-current-fmt-compiled org-clock-current-task org-clock-effort
		   org-agenda-skip-function org-agenda-skip-comment-trees org-agenda-archives-mode
		   org-end-time-was-given org-time-was-given org-log-note-extra org-log-note-purpose
		   org-log-post-message org-last-inserted-timestamp org-last-changed-timestamp
		   org-entry-property-inherited-from org-state org-agenda-headline-snapshot-before-repeat
		   org-agenda-buffer-name org-agenda-start-on-weekday org-agenda-buffer-tmp-name
		   org-log-note-marker org-priority-regexp org-mode-abbrev-table org-element-cache-persistent
		   org-element-cache-version buffer-face-mode-face org-tbl-menu org-org-menu org-struct-menu
		   org-entities org-last-state org-id-track-globally org-clock-start-time texmathp-why
		   remember-data-file org-agenda-tags-todo-honor-ignore-options calc-embedded-open-mode
		   calc-embedded-open-formula calc-embedded-close-formula align-mode-rules-list org-emphasis-alist
		   org-emphasis-regexp-components org-export-registered-backends org-modules crm-separator
		   org-babel-load-languages org-id-overriding-file-name org-indent-indentation-per-level
		   org-element--timestamp-regexp org-element-cache-map-continue-from
		   org-element-paragraph-separate org-agenda-buffer-name org-inlinetask-min-level t)
		  nil (add-hook 'change-major-mode-hook 'org-fold-show-all 'append 'local))
		 (closure
		  (org-src-window-setup *this* org-babel-confirm-evaluate-answer-no
		   org-babel-tangle-uncomment-comments org-src-lang-modes org-edit-src-content-indentation
		   org-babel-library-of-babel t)
		  nil (add-hook 'change-major-mode-hook #'org-babel-show-result-all 'append 'local))
		 org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-latex-format-drawer-function '(closure
				    (engrave-faces-latex-mathescape engrave-faces-current-preset-style
				     engrave-faces-latex-output-style t)
				    (_ contents) contents)
 org-latex-format-headline-function 'org-latex-format-headline-default-function
 org-confirm-shell-link-function 'yes-or-no-p
 org-html-format-drawer-function '(closure
				   (htmlize-buffer-places org-html-format-table-no-css htmlize-css-name-prefix
				    htmlize-output-type htmlize-output-type htmlize-css-name-prefix t)
				   (_name contents) contents)
 outline-isearch-open-invisible-function 'outline-isearch-open-invisible
 org-sort-function 'string-collate-lessp
 org-odt-format-headline-function 'org-odt-format-headline-default-function
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer org-src-mode-configure-edit-buffer)
 org-confirm-elisp-link-function 'yes-or-no-p
 org--warnings nil
 org-speed-command-hook '(org-speed-command-activate org-babel-speed-command-activate)
 org-html-format-inlinetask-function 'org-html-format-inlinetask-default-function
 org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default
 org-odt-format-drawer-function '(closure
				  (hfy-user-sheet-assoc hfy-html-quote-regex hfy-html-quote-map hfy-face-to-css
				   hfy-begin-span-handler hfy-end-span-handler archive-zip-extract
				   nxml-auto-insert-xml-declaration-flag t)
				  (_name contents) contents)
 org-persist-directory "/tmp/org-persist-auw53H"
 org-fold-core-isearch-open-function 'org-fold--isearch-reveal
 org-latex-format-inlinetask-function 'org-latex-format-inlinetask-default-function
 org-persist-before-write-hook '(org-element--cache-persist-before-write)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand)
 org-link-shell-confirm-function 'yes-or-no-p
 org-babel-pre-tangle-hook '(save-buffer)
 org-agenda-loop-over-headlines-in-active-region nil
 org-occur-hook '(org-first-headline-recenter)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-link-parameters '(("attachment" :follow org-attach-follow :complete org-attach-complete-link)
		       ("id" :follow org-id-open :store org-id-store-link-maybe)
		       ("eww" :follow org-eww-open :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
			:insert-description org-info-description-as-command)
		       ("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)
		       ("doi" :follow org-link-doi-open :export org-link-doi-export) ("file+sys") ("file+emacs")
		       ("shell" :follow org-link--open-shell)
		       ("news" :follow
			(closure ((scheme . "news")) (url arg) (browse-url (concat scheme ":" url) arg)))
		       ("mailto" :follow
			(closure ((scheme . "mailto")) (url arg) (browse-url (concat scheme ":" url) arg)))
		       ("https" :follow
			(closure ((scheme . "https")) (url arg) (browse-url (concat scheme ":" url) arg)))
		       ("http" :follow
			(closure ((scheme . "http")) (url arg) (browse-url (concat scheme ":" url) arg)))
		       ("ftp" :follow
			(closure ((scheme . "ftp")) (url arg) (browse-url (concat scheme ":" url) arg)))
		       ("shortdoc" :follow org-link--open-shortdoc :store org-link--store-shortdoc :complete
			org-link--complete-shortdoc)
		       ("help" :follow org-link--open-help :store org-link--store-help)
		       ("file" :complete org-link-complete-file) ("elisp" :follow org-link--open-elisp))
 org-html-format-headline-function 'org-html-format-headline-default-function
 org-metaup-hook '(org-babel-load-in-session-maybe)
 )


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