[PATCH 00/35] Merge org-fold feature branch

[Ihor Radchenko]

It took a while, but I am finally done with rebasing the org-fold
branch code onto current main.  This branch has been tested by me and
other volunteers for over a year.  Things are basically stable using
recent Emacs versions.  There were a couple of back-compatibility
issues with older Emacs, which I fixed during the cleanup.  Those may
need to be tested more carefully after merging to main.

I would like to thank all the people who helped with bug reporting and
provided bugfixes over the testing time. Thank you all - arkhan,
HyunggyuJang, Robert Irelan, Alois Janíček, Anders Johansson, Daniel
Kraus, Ypot, ntharim, Colin McLear, Yiming Chen, tpeacock19, and Karl
Voit.

After the cleanup, some patches are not included for the merge.  Apart
from my patches, 3 patches by Anders Johansson are included here.  He
has signed FSF copyright paperwork and appears on the Org mode
contributor list (https://orgmode.org/worg/contributors.html).

Unless there are comments on the patches below, I plan to merge the
branch in the coming weeks.  Please, let me know if I still need to
wait for comments.

Anders Johansson (3):
  Fix typo: delete-duplicates → delete-dups
  Fix bug in org-get-heading
  Rename remaining org-force-cycle-archived → org-cycle-force-archived

Ihor Radchenko (32):
  Add org-fold-core: new folding engine
  Separate folding functions from org.el into new library: org-fold
  Separate cycling functions from org.el into new library: org-cycle
  Remove functions from org.el that are now moved elsewhere
  Disable native-comp in agenda
  org-macs: New function org-find-text-property-region
  org-at-heading-p: Accept optional argument
  org-string-width: Reimplement to work with new folding
  Rename old function call to use org-fold
  Implement link folding
  Implement overlay- and text-property-based versions of some functions
  org-fold: Handle indirect buffer visibility
  Fix subtle differences between overlays and invisible text properties
  Support extra org-fold optimisations for huge buffers
  Alias new org-fold functions to their old shorter names
  Obsolete old function names that are now in org-fold
  org-compat: Work around some third-party packages using outline-*
    functions
  Move `org-buffer-list' to org-macs.el
  Restore old visibility behaviour of org-refile
  Add org-fold-related tests
  org-manual: Update to new org-fold function names
  ORG-NEWS: Add list of changes
  Backport contributed commits
  Fix org-fold--hide-drawers--overlays
  org-string-width: Handle undefined behaviour in older Emacs
  org-string-width: Work around `window-pixel-width' bug in old Emacs
  org-fold-show-set-visibility: Fix edge case when folded region is at
    BOB
  org-fold-core: Fix fontification inside folded regions
  test-org/string-width: Add tests for strings with prefix properties
  org--string-from-props: Fix handling folds in Emacs <28
  org-link-make-string: Throw error when both LINK and DESCRIPTION are
    empty
  test-ol/org-toggle-link-display: Fix compatibility with old Emacs

 doc/org-manual.org            |   14 +-
 etc/ORG-NEWS                  |  104 ++
 lisp/ob-core.el               |   14 +-
 lisp/ob-lilypond.el           |    4 +-
 lisp/ob-ref.el                |    4 +-
 lisp/ol.el                    |   59 +-
 lisp/org-agenda.el            |   50 +-
 lisp/org-archive.el           |   12 +-
 lisp/org-capture.el           |    7 +-
 lisp/org-clock.el             |  126 +-
 lisp/org-colview.el           |   10 +-
 lisp/org-compat.el            |  189 ++-
 lisp/org-crypt.el             |    8 +-
 lisp/org-cycle.el             |  818 +++++++++++
 lisp/org-element.el           |   55 +-
 lisp/org-feed.el              |    4 +-
 lisp/org-fold-core.el         | 1503 +++++++++++++++++++
 lisp/org-fold.el              | 1132 +++++++++++++++
 lisp/org-footnote.el          |    6 +-
 lisp/org-goto.el              |    6 +-
 lisp/org-id.el                |    4 +-
 lisp/org-inlinetask.el        |   26 +-
 lisp/org-keys.el              |   26 +-
 lisp/org-lint.el              |    3 +-
 lisp/org-list.el              |   84 +-
 lisp/org-macs.el              |  290 +++-
 lisp/org-mobile.el            |    2 +-
 lisp/org-mouse.el             |    4 +-
 lisp/org-refile.el            |    3 +-
 lisp/org-src.el               |    6 +-
 lisp/org-timer.el             |    2 +-
 lisp/org.el                   | 2552 +++++++++++----------------------
 lisp/ox-org.el                |    2 +-
 lisp/ox.el                    |    4 +-
 testing/lisp/test-ob.el       |   12 +-
 testing/lisp/test-ol.el       |   24 +
 testing/lisp/test-org-list.el |   75 +-
 testing/lisp/test-org-macs.el |    6 +-
 testing/lisp/test-org.el      |  258 +++-
 39 files changed, 5475 insertions(+), 2033 deletions(-)
 create mode 100644 lisp/org-cycle.el
 create mode 100644 lisp/org-fold-core.el
 create mode 100644 lisp/org-fold.el

-- 
2.34.1