Merge from origin/emacs-28

af01b674ce (origin/emacs-28) ; Fix spacing in previous commit
915e044d60 Use the correct label in the warning
6e83a4100a ; * admin/make-tarball.txt: Should configure --with-native...
525602d682 ; * etc/TODO (display): Add entry about Default_Ignorables.
65de510c16 ; Fix 'restore-buffer-modified-p' doc string typo
9d8202b45e Add Emacs 27 compatibility hack
89d64fca75 Pacify GCC 10.3 -Wmaybe-uninitialized
bb8ef1aa30 * lisp/tab-bar.el (tab-detach, tab-window-detach): New ali...
7ae70054aa ; * src/composite.h (LGSTRING_FONT): Add comment about its...
1af00e67d6 Include the refcards in the release tarball
3c29fb705c ; * src/Makefile.in (../native-lisp): Make the long recipe...

diff --cc lisp/progmodes/xref.el
Simple merge

diff --cc src/buffer.c
Simple merge