master updated (52270aa -> b72ddbd)

[Glenn Morris]

gm pushed a change to branch master.

      from  52270aa   Optimise tail calls in `and` and `or` forms in 
`cl-labels` functions
      adds  a296002   Revert "* lisp/mouse.el: Fix mouse-1-clock-follows-mouse 
= double"
       new  843eb21   ; Merge from origin/emacs-27
      adds  876b95b   Teach Rmail about NBSP in "Re:"
      adds  f60eb98   Fix typos and omissions for (elisp)Button Buffer Commands
       new  d92b725   Merge from origin/emacs-27
      adds  b9ec611   Fix buffer overflow in xbm_scan (bug#47094)
       new  88ab1d1   ; Merge from origin/emacs-27
      adds  be1b351   Fix reference to 'diff-font-lock-syntax' in diff-mode 
documentation
      adds  a7f95d5   Remove duplicate @table item from ELisp manual
       new  29ca91f   Merge from origin/emacs-27
      adds  7ae4588   Document that `buffer-string' retains text properties
       new  94821a1   ; Merge from origin/emacs-27
      adds  216bd67   ; * admin/make-tarball.txt: Advise to remove stale 
subdirectories.
      adds  d5b160d   Prepare the Emacs 27.2 release.
       new  b72ddbd   Merge from origin/emacs-27


Summary of changes:
 ChangeLog.3              | 377 +++++++++++++++++++++++++++++++++++++++++++++++
 admin/make-tarball.txt   |   5 +
 doc/emacs/files.texi     |   5 +-
 doc/lispref/display.texi |   6 +-
 doc/lispref/objects.texi |   3 -
 etc/HISTORY              |   2 +
 etc/NEWS.27              |  24 ---
 lisp/mail/rmail.el       |   4 +-
 8 files changed, 392 insertions(+), 34 deletions(-)