* lisp/org-element.el (org-element-drawer-re-nogroup): New constant
regexp matching drawer line without creating regexp groups.
(org-element--current-element): Use the new constant.
* lisp/org.el (org-drawer-regexp): Ensure that it is the same with
org-element version and mark for removal/alias.
(org-property-drawer-re): Simplify, removing unnecessary matching of
node property structures.
Link: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63225#62
* lisp/org-element.el: Add commentary explaining some regexp-related
optimizations useful for the parser.
Link: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63225
(org-element--headline-deferred):
(org-element-item-parser):
(org-element-item-interpreter):
(org-element--list-struct):
(org-element-plain-list-parser):
(org-element-example-block-parser):
(org-element-fixed-width-interpreter):
(org-element-paragraph-parser):
(org-element-src-block-parser):
(org-element-table-parser):
(org-element--parse-generic-emphasis):
(org-element-export-snippet-interpreter):
(org-element-link-parser):
(org-element--current-element):
(org-element--collect-affiliated-keywords):
(org-element-parse-buffer):
(org-element-normalize-string):
(org-element-normalize-contents):
(org-element--parse-to):
(org-element--cache-before-change):
(org-element--cache-for-removal):
(org-element-context): Avoid storing match data unless strictly
necessary. Explain the necessity in places where we have to use
`save-match-data'. Prefer `looking-at-p' (does not alter match data)
to `looking-at'. Simplify regexps. Update docstrings clearly
indicating when match data might be modified.
* lisp/org.el:
(org-offer-links-in-entry):
* lisp/ob-exp.el (org-babel-exp-process-buffer):
* lisp/org-agenda.el: Fix places where we need to protect match data.
* lisp/org-element.el (org-element-begin):
(org-element-end):
(org-element-contents-begin):
(org-element-contents-end):
(org-element-post-affiliated):
(org-element-post-blank): New functions for fast access to frequently
used element properties. The functions are `setf'-able.
Update all the relevant code in Org to use the new functions instead
of genetic property queries.
* lisp/org-element.el (org-element-parse-buffer): Do not force-undefer
when new optional argument is provided.
* lisp/org-lint.el (org-lint--generate-reports):
* lisp/org.el (org-unindent-buffer):
* lisp/ox.el (org-export--missing-definitions):
(org-export--annotate-info): Do not undefer when unnecessary.
Adjust all the declare forms.
* lisp/org.el (org-outline-level):
* lisp/org.el (org-current-level): change undefined symbol names
to `org-odd-levels-only' and change "Unlike to" to "Unlike".
* lisp/org.el (org-priority-show): Do not wrongly assert that the
priority is affected by scheduled and deadline values. This was not
true in the past for Org mode buffers, and it is no longer true after
8fab6eeef renamed composite agenda rank from priority to urgency.
* etc/ORG-NEWS (~org-priority=show~ command no longer adjusts for
scheduled/deadline): Document the change, right before the NEWS item
describing changes in the agenda.
* lisp/org.el (org-indent-line): Fix when we are within blank lines
after heading. ELEMENT is then `heading' and looking at :begin - 1
does not make sense.
* testing/lisp/test-org.el (test-org/indent-region): Add test.
Reported-by: Jens Schmidt <jschmidt4gnu@vodafonemail.de>
Link: https://orgmode.org/list/d7129804-1f42-ea2b-85e8-18ea1ee32d73@vodafonemail.de
* lisp/org.el (org-display-inline-images): inline display of attached
images in link descriptions.
Previously, `org-display-inline-images' only inlined images in link
descriptions when they were explicit "file:" links. This change adds
support for "attachment:" links. E.g.:
[[https://orgmode.org][attachment:emacs-screenshot.png]]
* lisp/org.el (org-insert-todo-heading-respect-content): Do not force
first TODO keyword in the inserted heading. Instead, accept prefix
arguments and pass them directly to `org-insert-todo-heading'.
* etc/ORG-NEWS (~org-insert-todo-heading-respect-content~ now accepts
prefix arguments): Document the change.
*
testing/lisp/test-org.el (test-org/insert-todo-heading-respect-content):
Add tests.
Reported-by: Xuan Wang <xuan.public@gmail.com>
Link: https://orgmode.org/list/CALjN2yehOVYZuU+tURes+mJ5XyTrRY1O0UG1ijH-6TjJ=W0ibw@mail.gmail.com
* lisp/org.el (org--create-inline-image): Allow `org-image-max-width'
to be a floating point value - fraction of window width.
(org-image-max-width): Update the docstring and type specification.
* lisp/org.el (org-mode-syntax-table): New explicitly defined variable
for Org mode syntax table.
(org-mode-tags-syntax-table): Define value in advance, available even
before Org mode is loaded.
(org-mode): Use the new `org-mode-syntax-table' variable.
Reported-by: Daniel Clemente <n142857@gmail.com>
Link: https://orgmode.org/list/CAJKAhPCcMwZS6aYK9MRKsjds9uTivOdfC9nzMok70Df8vR3tPA@mail.gmail.com
* lisp/org.el (org-return): When `org-return-follows-link' is non-nil
and point is over an org-cite citation or citation reference, call `org-open-at-point'.
TINYCHANGE
* lisp/org.el (org-add-prop-inherited): Do not modify argument by side
effect. Modifying strings may cause unexpected issues when working
with constant strings.
Link: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=62847
* lisp/org.el (org-mode-tags-syntax-table): New variable holding
syntax table for tags.
(org-mode): Initialize tag syntax table.
(org-make-tags-matcher): Match tags using appropriate syntax table.
(org-tags-expand): Do no modify syntax table by side effect.
Reported-by: Mattias Engdegård <mattias.engdegard@gmail.com>
Link: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63225#68
* lisp/org.el (org-delete-indentation): Support active region when the
first line in region is a heading. Clarify in the docstring that
region is ignored with prefix argument.
Reported-by: Spencer Baugh <sbaugh@janestreet.com>
Link: https://orgmode.org/list/ier3552edfr.fsf@janestreet.com
* lisp/org.el (org-time-stamp-formats):
(org-timestamp-formats):
(org-time-stamp-rounding-minutes):
(org-timestamp-rounding-minutes):
(org-time-stamp-custom-formats):
(org-timestamp-custom-formats):
(org-time-stamp):
(org-timestamp):
(org-time-stamp-inactive):
(org-timestamp-inactive):
(org-insert-time-stamp):
(org-insert-timestamp):
(org-toggle-time-stamp-overlays):
(org-toggle-timestamp-overlays):
(org-time-stamp-to-now):
(org-timestamp-to-now):
* lisp/ox.el (org-export-time-stamp-file):
(org-export-timestamp-file): Rename using "timestamp" term, keeping
the old name as alias.
* doc/org-manual.org: Update all the uses, adding #+findex and
#+vindex entries. Keep the alias names for searchability.
Adjust all the callers.
The following "time-stamp" uses are unchanged:
1. `org-time-stamp-format' where obsolete and _different_ function
`org-timestamp-format' still exists.
2. :time-stamp-file property in export INFO plist. Changing this
would be breaking.
3. ORG-NEWS remains unchanged.
* lisp/ob-core.el (org-babel-insert-result): Comment out unused `cond'
clause. Still leave it there for readability of the logic.
* lisp/org.el (org-agenda-restrict-begin):
(org-agenda-restrict):
(org-agenda-restrict-end): Mark variables from org-agenda.
* lisp/org.el (org--collect-keywords-1): Do not inhibit SETUPFILE in
read-only buffers.
It is unclear what kind of edge case the FIXME is trying to solve.
Yet, there is no reason to inhibit SETUPFILE processing in all the
read-only buffers (which may happen, for example, when refreshing Org
setup with C-c C-c). Finally, if there is some bug in Gnus (if any)
we should better report it instead of using unexplained workaround.
Also, do not use [^\000] as a poor-man's replacement for
(rx (or any newline)).
* lisp/ob-core.el (org-babel-src-block-regexp):
* lisp/ob-haskell.el (org-babel-haskell-export-to-lhs):
* lisp/org-compat.el (org-hide-block-toggle-all):
* lisp/org-element.el:
* lisp/org-feed.el (org-feed-read-previous-status):
(org-feed-parse-rss-feed):
(org-feed-parse-rss-entry):
* lisp/ox-org.el (org-org-publish-to-org):
* testing/lisp/test-ob-tangle.el:
* lisp/org.el (org-block-regexp):
(org-clock-drawer-re): Use \(.\|\n\) regexp instead of [^\000].
(org-latex-regexps): Do not try to match \000 inside latex fragments -
we now use parser for this purpose.
Reported-by: Tommy Kelly <tommy.kelly@verilab.com>
Link: https://orgmode.org/list/875yfk9vlv.fsf@localhost
* doc/org-manual.org (Exporting): Add cindex entry for both "backend"
and "back-end" for better searchability.
All other changes are trivial.
Note that `org-element-export-snippet-parser' will still use :back-end
property. So will ox.el in INFO channel.
* lisp/org-fold.el (org-fold-catch-invisible-edits-commands): New
custom option.
(org-fold-catch-invisible-edits): Mention the new custom option in the
docstring.
(org-fold-check-before-invisible-edit-maybe): New function checking
if edits are safe for `this-command'.
(org-fold--advice-edit-commands): New function advising the functions
with `org-fold-check-before-invisible-edit-maybe'.
* lisp/org.el (org-mode): Advice functions on Org startup.
(org-self-insert-command):
(org-delete-backward-char):
(org-delete-char):
(org-meta-return): Do not call `org-fold-check-before-invisible-edit'
and rely on the new advise mechanism instead.
* etc/ORG-NEWS (Commands affected by ~org-fold-catch-invisible-edits~
can now be customized): Announce the change.
* doc/org-manual.org (Catching invisible edits): Mention new
customization.
* lisp/org.el (org-image-max-width): New custom variable controlling
max inline image width.
(org--create-inline-image): Use the new variable.
* doc/org-manual.org (Images):
* etc/ORG-NEWS (New customization ~org-image-max-width~ limiting the
displayed inline image width): Document the new variable.
* lisp/org.el (org-fontify-meta-lines-and-blocks-1): Allow fontifying
src blocks with language specification missing.
* lisp/org-src.el (org-src-block-faces): Clarify in the docstring that
"" language name referes to src blocks with no language. Remove
redundant :version tag.
* etc/ORG-NEWS (~org-src-block-faces~ now accepts empty string ~""~ as
language name): Announce the change.
Link: https://orgmode.org/list/99388ff3711696091f0312a5c3f0bcbd@kragelund.me
* lisp/org.el (org-remove-timestamp-with-keyword): Use `delete-char'
instead of for-interactive-use-only `backward-delete-char'.
(org-fast-tag-selection): Remove unnecessary `condition-case'.
(org-delete-backward-char): Make it explicit that we fall back to
normal interactive call.
Link: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=62518
* lisp/org.el (org-at-date-range-p):
(org--math-p):
(org-first-sibling-p): Remove interactive spec.
Predicates like `org-first-sibling-p' are no use when called
interactively, and should not appear in the M-x prompt.
TINYCHANGE
* org-id.el (org-id-uuid): Move to org-macs.el.
* org.el (org-uuidgen-p): Move to org-macs.el. Expose regexp used to
match UUID.
* org-macs.el (org-uuid-regexp): Refactor `org-uuidgen-p' to expose
regexp used to match UUID.
* lisp/org.el (org-read-date): When DEFAULT-TIME time provided, prefer
it even when `org-extend-today-until' dictates -1 day shift. We
should only consider `org-extend-today-until' for actual today times,
not for future dates, where is becomes confusing.
Reported-by: Tim Ruffing <crypto@timruffing.de>
Link: https://orgmode.org/list/3489c1917ad4be0625ea5f0b2c1b0f2b72ea39e9.camel@timruffing.de
* lisp/org.el (org-babel-load-languages): Sync with Babel files
(org-babel-load-languages): Synchronize the defcustom with the rest of
the code base, group languages by Org Babel file, and spell languages
using camel case (the current fashion).
Link: https://list.orgmode.org/712f2ef5b4edb2d9b565f6467e582030@posteo.net/
* lisp/org.el (org-file-contents): Wrap the
`url-retrieve-synchronously' call into a `condition-case' block to
avoid throwing an error when NOERROR is non-nil.
TINYCHANGE
* lisp/org-compat.el (version<): Use stub version of
`combine-change-calls' when it does not exist yet in Emacs or when it
is known to have a critical bug. Use `org-combine-change-calls'
instead of overwriting the macro system-wide.
* lisp/org-footnote.el (org-footnote-sort):
* lisp/org.el:
(org-demote-subtree):
(org-paste-subtree): Use the new macro name.
Reported-by: Alain.Cochard@unistra.fr
Link: https://orgmode.org/list/87ilhq74j8.fsf@localhost
* lisp/org-list.el (org-list-indent-item-generic):
* lisp/org.el (org-do-promote):
(org-do-demote): Do not deactivate mark after edits.
(org-metadown):
(org-metaup): Do not deactivate mark and do not exchange point and
mark in region.
* etc/ORG-NEWS (Datetree structure headlines can now be complex):
Announce the change.
* lisp/org.el (org-metaup):
(org-metadown): When active region contains headings, move the
containing subtrees according to the selection. Do not deactive
region.
* testing/lisp/test-org.el (test-org/move-subtree): Add test.
* etc/ORG-NEWS (~org-metaup~ and ~org-metadown~ now act on headings in
region): Announce the new features.
* lisp/org.el (org-update-dblock): Clarify that `org-update-dblock' is
called for side effects.
Reported-by: Marcin Borkowski <mbork@mbork.pl>
Link: https://orgmode.org/list/87sfg1nfii.fsf@mbork.pl
* lisp/org.el (org-place-formula-image, org-format-latex): Extract the
overlay placement component of `org-format-latex' into a new function
`org-place-formula-image`.
* lisp/org.el (org-notes-order-reversed-p): Return value is
org-reverse-note-order if it is neither nil or a list.
E.g. before nil has been returned when org-reverse-note-order was a
symbol. And this did not meet the documentation of
org-reverse-note-order.
* lisp/org.el (org-paste-subtree): Remove the whole line when level
indicator is provided. Improve check for level indicator.
* testing/lisp/test-org.el (test-org/paste-subtree): Add test.
Reported-by: Philipp Kiefer <phil.kiefer@gmail.com>
Link: https://orgmode.org/list/a2cc49d3-7f65-5f6a-8f05-21e5056335b3@gmail.com
* lisp/org.el (org-timestamp-change): Add FIXME comment to
re-implement the logic in future to avoid `save-excursion' markers
being moved to the end of timestamp.
* lisp/org.el (org--math-always-on): Rename to `org--math-p' and only
override `texmathp' when current command is `cdlatex-math-symbol' or
when we are inside Org LaTeX math fragment. Only these two scenarios
are the places where `texmathp' may not work properly in Org files.
We must not return t outside latex fragments as initially suggested by
the docstring because it would break, for example, `cdlatex-dollar'
command.
(org-cdlatex-mode): Use the new function name for advice.
* lisp/org-compat.el (org--math-always-on): Declare obsolete.
Reported-by: Daniel Fleischer <danflscr@gmail.com>
Link: https://orgmode.org/list/m2cz7sj5zt.fsf@gmail.com
* lisp/org.el (org-mode): Do not suppress modification hooks when
aligning tables. Otherwise, cache state may become invalid.
Reported-by: Stefan <org@stefan.failing.systems>
Link: https://orgmode.org/list/87tu1wse45.fsf@localhost
* lisp/org-persist.el (org-persist-read): Only return the requested
containers. Add new optional keyword argument :read-related to read
the containers stored together with requested. Update the docstring
accordingly.
(org-persist-load): Update definition according to `org-persist-read'.
* lisp/org.el (org-mode): Explicitly load all the associated
cache variables.
* lisp/org.el (org--confirm-resource-safe, org--safe-remote-resource-p):
Replace instances of buffer-file-name
with (buffer-file-name (buffer-base-buffer)) so these functions work in
indirect buffers.
* lisp/org.el (org-hide-drawer-startup): Make alias to
`org-cycle-hide-drawer-startup'.
Reported-by: Kévin Le Gouguec <kevin.legouguec@gmail.com>
Link: https://orgmode.org/list/877cyvzrcu.fsf@gmail.com
* lisp/org.el (org-display-inline-remove-overlay): Force remove
overlay images from Emacs image cache when un-displaying inline image
overlays. This change should: (1) slightly improve Emacs memory usage
when the number of inline images is large; (2) Clear images from cache
every time Emacs removes the overlay for any
reason. (`org-display-inline-remove-overlay' is used in
overlay 'modification-hooks.)
* lisp/org.el (org-display-inline-remove-overlay): Force remove
overlay images from Emacs image cache when un-displaying inline image
overlays. This change should: (1) slightly improve Emacs memory usage
when the number of inline images is large; (2) Clear images from cache
every time Emacs removes the overlay for any
reason. (`org-display-inline-remove-overlay' is used in
overlay 'modification-hooks.)
* lisp/org.el (org--confirm-resource-safe, org--safe-remote-resource-p):
Replace instances of buffer-file-name
with (buffer-file-name (buffer-base-buffer)) so these functions work in
indirect buffers.
* lisp/org.el (org-display-inline-images): Always refresh cached
images when displaying image overlays. See Emacs bug#59902. This
fixes images not updating when image file is changed on disk.
Reported-by: William Denton <wtd@pobox.com>
Link: https://orgmode.org/list/87wn7287n2.fsf@localhost
* lisp/org.el (org-inside-LaTeX-fragment-p): Use `org-element-context'
to analyze context at point instead of ad-hoc regexp matching. Do not
return undocumented cons cell. Update docstring dropping all the
previously listed caveats. Add new optional argument ELEMENT to
provide element at point.
(org--math-always-on): Follow new `org-inside-LaTeX-fragment-p' return
value spec. Do no rely on previous undocumented convention.
Reported-by: Justin Silverman <jsilve24@gmail.com>
Link: https://orgmode.org/list/87v8mktt38.fsf@gmail.com
* lisp/org.el (org-make-tags-matcher): Match
<now>/<today>/<tomorrow>/<+3d>/etc time queries. They are allowed by
"11.3.3 Matching tags and properties" section of the manual.
Fixes regression from e022a0cea.
Reported-by: Carlo Tambuatco <oraclmaster@gmail.com>
Link: https://orgmode.org/list/87bkokgtd7.fsf@kyleam.com
lisp/org.el: (org-narrow-to-subtree, org-toggle-narrow-to-subtree,
org-narrow-to-block, org-narrow-to-element): Mention how to widen in
docstrings of commands that do narrowing.
TINYCHANGE
* lisp/ob-clojure.el
(ob-clojure-babashka-command, ob-clojure-nbb-command):
Account for the possibility of nil (commands absent).
* lisp/org.el (org-safe-remote-resources):
* lisp/ox-md.el (org-md-toplevel-hlevel):
Fix incorrect or invalid types.
Fix types in various defcustom declarations
4b2f5425d7af1a6f992ad8ce0a4452a2e778815a
Mattias Engdegård
Thu Dec 1 13:03:19 2022 +0100
[km] The natnum change will be adjusted in an upcoming commit because
natnum not available until Emacs 28.
* lisp/org.el (org-preview-latex-process-alist): Use long option names
when launching dvisvgm, optimizing for maintainability, instead of
brevity. For example, use `--no-fonts' instead of `-n'.
* lisp/org.el (org-preview-latex-process-alist): Call `dvisvgm' with
`-e' (`--exact-bbox') instead of `-b min' (`--bbox=min') to measure
the exact bounds around visual glyphs, as opposed to using font
metrics, to avoid clipping at the edges.
Link: https://orgmode.org/list/m2v8n4w00w.fsf@me.com
* lisp/org.el (org--inline-image-overlays): New function returning
overlays in region.
(org-toggle-inline-images): Respect BEG and END arguments when
determining presence of overlays.
(org-remove-inline-images): Clear up deleted overlays.
Reported-by: William Denton <wtd@pobox.com>
Link: https://orgmode.org/list/alpine.DEB.2.22.394.2211221559080.61289@shell3.miskatonic.org
* lisp/org.el (org-set-regexps-and-options): Allow spaces when
defining link abbreviations via #+LINK keyword.
* testing/lisp/test-org-element.el (test-org-element/link-parser): Add
a new test.
* doc/org-manual.org (Link Abbreviations): Add example demonstrating
link abbreviation with spaces.
Reported-by: Rudolf Adamkovič <salutis@me.com>
Link: https://orgmode.org/list/87zgf7zujc.fsf@localhost
* lisp/ob-tangle.el (org-babel-tangle): Add missing group definition.
(org-babel-post-tangle-hook):
(org-babel-pre-tangle-hook):
(org-babel-tangle-body-hook):
(org-babel-tangle-finished-hook):
(org-babel-tangle-comment-format-beg):
(org-babel-tangle-comment-format-end):
(org-babel-tangle-uncomment-comments):
(org-babel-process-comment-text):
(org-babel-tangle-default-file-mode): Move under `org-babel-tangle'
group.
* lisp/ol-bbdb.el (org-bbdb-anniversaries): Move under `org-agenda'
instead of a non-existent `org-bbdb'.
* lisp/ol-bibtex.el (org-bibtex): Add missing group definition.
* lisp/ol-gnus.el (org-gnus-no-server): Move under group
`org-link-follow' instead of a non-existent `org-gnus'.
* lisp/org-plot.el (org-plot): Add missing group definition.
* lisp/org.el (org-startup): Add missing group definition.
* lisp/ox-latex.el (org-latex-pdf-process): Move under
`org-export-latex' instead of a non-existent `org-export-pdf'.
* lisp/ox-man.el (org-man-pdf-process): Remove reference to
non-existent group `org-export-pdf'.
TINYCHANGE
* lisp/org.el (org-time-stamp-formats):
* lisp/org.el (org-time-stamp-custom-formats): Change the default
values stripping leading "<" and trailing ">". Update the docstring
explaining the format and that leading and trailing brackets are now
ignored. Update the :type specification to more precise.
(org-time-stamp-format): Update the argument list and docstring
allowing to use the function more flexibly to find the time stamp
format for both `org-time-stamp-formats' and
`org-time-stamp-custom-formats'. Rename `long' argument to more
accurate `with-time'. Ignore brackets in the `org-time-stamp-formats'
and `org-time-stamp-custom-formats'. Allow `inactive' argument to be
`no-brackets'
(org-format-timestamp):
(org-read-date-display):
(org-insert-time-stamp):
(org-display-custom-time):
(org-timestamp-translate):
* lisp/org-compat.el (org-timestamp-format): Rename
`org-timestamp-format' to `org-format-timestamp'. The old variant is
too similar with other `org-time-stamp-format' function. Also, use
`org-time-stamp-format' to determine the timestamp format instead of
using `org-time-stamp-formats' directly.
* lisp/ol.el (org-store-link):
* lisp/org-agenda.el (org-agenda-get-timestamps):
(org-agenda-get-progress):
* lisp/org-archive.el (org-archive-subtree):
(org-archive-to-archive-sibling):
* lisp/org-clock.el (org-clock-special-range):
* lisp/org-colview.el (org-colview-construct-allowed-dates):
* lisp/org-element.el (org-element-timestamp-interpreter):
* lisp/org-macro.el (org-macro--find-date):
* lisp/org-pcomplete.el (pcomplete/org-mode/file-option/date):
* lisp/ox-odt.el (org-odt--format-timestamp):
(org-odt-template):
* lisp/ox.el (org-export-get-date):
* testing/lisp/test-org.el (test-org/timestamp-format): Use
`org-time-stamp-format' instead of directly examining
`org-time-stamp-custom-formats' and `org-time-stamp-formats'. Use the
new function name `org-format-timestamp'.
* etc/ORG-NEWS (Default values and interpretations of ~org-time-stamp-formats~ and ~org-time-stamp-custom-formats~ are changed):
(~org-timestamp-format~ is renamed to ~org-format-timestamp~):
(Updated argument list in ~org-time-stamp-format~): Document the
user-facing changes.
This commit documents and unifies previously undocumented assumptions
about the values of `org-time-stamp-formats' and
`org-time-stamp-custom-formats'. Instead of fiddling with
leading/trailing brackets in the values, expedite the time format
calculation to `org-time-stamp-format'. The undocumented assumption
about brackets in user option `org-time-stamp-custom-formats' is not
relaxed making the docstring correct.
Reported-by: Uwe Brauer <oub@mat.ucm.es>
Link: https://orgmode.org/list/87k04ppp1t.fsf@localhost
Previously, calling this function on an indirect buffer would fail,
preventing the user from making a new indirect buffer based on an
indirect buffer (e.g. imagine the user makes an indirect buffer for a
large subtree, then wants to make another one for a subtree of that).
Now, the base buffer of the buffer is used, when applicable.
Also, the function is partially rewritten to be clearer, and a
docstring is added.
Link: https://orgmode.org/list/8b2c1814-2c6f-fdca-8ba7-63c415bfca5e@alphapapa.net
* lisp/org.el (org-kill-is-subtree-p): Allow `current-kill' to return
clipboard (even when `kill-ring' is empty). Do not throw error when
clipboard is also empty.