Merge from origin/emacs-27

71fc003860 (origin/emacs-27) Avoid infloop in 'format-mode-line'
247dcb4b1b Clarify the documentation of 'left/right-fringe' display spec
d453cee177 Minor improvement in ELisp manual
3c778c443c * doc/misc/tramp.texi (Customizing Methods): Fix typo.

diff --cc doc/lispref/display.texi
Simple merge

diff --cc doc/lispref/frames.texi
Simple merge

diff --cc doc/misc/tramp.texi
Simple merge

diff --cc src/xdisp.c
Simple merge