master updated (8f69483 -> 5d5d5d4)

[Glenn Morris]

gm pushed a change to branch master.

      from  8f69483   Avoid extra "changed on disk" prompt in save-buffer 
(Bug#18336)
      adds  1aa1529   ERC: Update maintainer address
      adds  bed04c5   Use correct registry name for windows-1251 charset
       new  d5cfc4a   Merge from origin/emacs-27
      adds  d801d1d   Don't have exif bugging out on short strings
       new  7832e61   ; Merge from origin/emacs-27
      adds  7515252   * lisp/tab-line.el (tab-line-new-button-show): New 
defcustom.
      adds  b28a9a6   Make svg images with links valid
      adds  561e9fb   Improve documentation of project.el commands
      adds  9ab85f0   Fix cl-concatenate (Bug#40180)
      adds  8709aad   Fix a couple of problems in changelog generating functions
      adds  8944310   Don't signal during backtrace unrewind (Bug#40088)
      adds  f2351a6   Add Harfbuzz dependency
      adds  d66331a   Don't build the Gnulib 'utimens' module on MinGW
       new  5d5d5d4   Merge from origin/emacs-27


Summary of changes:
 admin/nt/dist-build/build-dep-zips.py  |  1 +
 doc/emacs/emacs.texi                   |  1 +
 doc/emacs/maintaining.texi             | 75 ++++++++++++++++++++++++++++++++++
 etc/NEWS.27                            |  3 ++
 lisp/emacs-lisp/cl-extra.el            |  2 +-
 lisp/erc/erc-autoaway.el               |  2 +-
 lisp/erc/erc-backend.el                |  2 +-
 lisp/erc/erc-button.el                 |  2 +-
 lisp/erc/erc-capab.el                  |  2 +-
 lisp/erc/erc-compat.el                 |  2 +-
 lisp/erc/erc-dcc.el                    |  2 +-
 lisp/erc/erc-desktop-notifications.el  |  2 +-
 lisp/erc/erc-ezbounce.el               |  2 +-
 lisp/erc/erc-fill.el                   |  2 +-
 lisp/erc/erc-goodies.el                |  2 +-
 lisp/erc/erc-ibuffer.el                |  2 +-
 lisp/erc/erc-identd.el                 |  2 +-
 lisp/erc/erc-imenu.el                  |  2 +-
 lisp/erc/erc-join.el                   |  2 +-
 lisp/erc/erc-lang.el                   |  2 +-
 lisp/erc/erc-list.el                   |  2 +-
 lisp/erc/erc-log.el                    |  2 +-
 lisp/erc/erc-match.el                  |  2 +-
 lisp/erc/erc-menu.el                   |  2 +-
 lisp/erc/erc-netsplit.el               |  2 +-
 lisp/erc/erc-networks.el               |  2 +-
 lisp/erc/erc-notify.el                 |  2 +-
 lisp/erc/erc-page.el                   |  2 +-
 lisp/erc/erc-pcomplete.el              |  2 +-
 lisp/erc/erc-replace.el                |  2 +-
 lisp/erc/erc-ring.el                   |  2 +-
 lisp/erc/erc-services.el               |  2 +-
 lisp/erc/erc-sound.el                  |  2 +-
 lisp/erc/erc-speedbar.el               |  2 +-
 lisp/erc/erc-spelling.el               |  2 +-
 lisp/erc/erc-stamp.el                  |  2 +-
 lisp/erc/erc-track.el                  |  2 +-
 lisp/erc/erc-truncate.el               |  2 +-
 lisp/erc/erc-xdcc.el                   |  2 +-
 lisp/erc/erc.el                        |  2 +-
 lisp/progmodes/project.el              | 11 +++--
 lisp/svg.el                            |  3 +-
 lisp/tab-line.el                       | 22 +++++++---
 lisp/vc/diff-mode.el                   | 49 +++++++++++-----------
 lisp/vc/log-edit.el                    | 26 ++++++------
 nt/gnulib-cfg.mk                       |  1 +
 src/data.c                             |  2 +-
 src/eval.c                             |  4 +-
 src/ftfont.c                           |  2 +-
 src/lisp.h                             |  1 +
 test/lisp/emacs-lisp/cl-extra-tests.el |  8 ++++
 51 files changed, 195 insertions(+), 86 deletions(-)