master updated (f7748ad -> 5195678)

[Glenn Morris]

gm pushed a change to branch master.

      from  f7748ad   Fix GDI+ image loading by file name
      adds  692ad40   Improve the documentation of tab-bar and tab-line
      adds  a64da75   Add image-auto-resize defcustoms to image-mode.el
      adds  fc55f65   Minor improvements in documentation of the last change
      adds  d2836fe   Improve the default value of 
'doc-view-ghostscript-program'.
      adds  400ff5c   Improve wording about constants
      adds  ba6104d   Change doc-view-mode-map prefix key 's' to 'c'.
      adds  37ebec3   Improve the default value of 
'doc-view-ghostscript-program'.
      adds  5a25d17   * lisp/image-mode.el (image-transform-resize): Remove 
FIXME comment.
      adds  a92ca1f   Improve indexing of ELisp manual
      adds  369761b   ; * src/xdisp.c: Improve the introductory commentary.
      adds  f7e488d   Calc: fix autoload errors (bug#40800)
      adds  a76af88   Tweak mutability doc a bit more
      adds  4d86c7f   Fix documentation of fringe bitmaps
      adds  3d0e859   Minor doc clarification regarding fringe bitmaps
      adds  74a92be   * lisp/simple.el (kill-ring-save): Doc fix.  (Bug#40797)
      adds  821760f   Don't let a code literal get modified in mml parsing 
(Bug#39884)
      adds  45a64c9   Clarify semantics of trace-function CONTEXT argument
       new  5195678   Merge from origin/emacs-27


Summary of changes:
 doc/emacs/display.texi   |   1 +
 doc/emacs/emacs.texi     |   1 +
 doc/emacs/files.texi     |  37 +++++--
 doc/emacs/frames.texi    |  62 ++++++++---
 doc/emacs/glossary.texi  |   2 +-
 doc/emacs/misc.texi      |  10 +-
 doc/emacs/modes.texi     |   2 +-
 doc/emacs/windows.texi   |  37 +++++--
 doc/lispref/display.texi |  10 +-
 doc/lispref/eval.texi    |   6 ++
 doc/lispref/lists.texi   |   7 +-
 doc/lispref/objects.texi |  21 ++--
 doc/lispref/tips.texi    |   1 +
 etc/NEWS.27              |  64 ++++++-----
 lisp/calc/calc-ext.el    |   9 +-
 lisp/calc/calc-prog.el   |   5 -
 lisp/doc-view.el         |  32 ++++--
 lisp/emacs-lisp/trace.el |   4 +-
 lisp/gnus/mml.el         |   2 +-
 lisp/image-mode.el       |  55 ++++++++--
 lisp/simple.el           |   2 +-
 src/xdisp.c              | 271 ++++++++++++++++++++++++++++++-----------------
 22 files changed, 436 insertions(+), 205 deletions(-)