Merge from origin/emacs-27

448df8fec7 Improve doc-strings of 'quit-window' and 'quit-restore-win...
7f01dfca56 Fix MH-E bug #470: Show buffer discards text properties
f95a2b8301 Fix some broken conditional forms
28727444f1 Fix a scoping error in tramp-sudoedit.el
6cbdd048bd * lisp/autorevert.el (auto-revert-notify-handler): Fix bra...
076dd1f69a Fix typo in 'window_box_height'

diff --cc lisp/org/org-agenda.el
Simple merge

diff --cc src/xdisp.c
Simple merge