Merge from origin/emacs-27

8576297b2a (origin/emacs-27) ; lisp/so-long.el: Prevent potential err...
986c12b20f ; * lisp/so-long.el: Byte-compilation bug fix
19f8f36f11 ; * lisp/so-long.el (so-long-variable-overrides): Improve doc
83bc4ad369 ; * so-long.el: Documentation and spelling
72c5f71cd4 Avoid segfaults if XIM is set but not xim_styles
f54ddb0198 (emacs-27) ; * test/lisp/emacs-lisp/generator-tests.el: St...

# Conflicts:
#	test/lisp/emacs-lisp/generator-tests.el

diff --cc lisp/so-long.el
Simple merge

diff --cc src/xfns.c
Simple merge

diff --cc test/lisp/emacs-lisp/generator-tests.el
Simple merge