Merge from origin/emacs-27

6de20c7eab (origin/emacs-27) Fix syntax error in man page.
f8607d3c03 Handle filling of indented ChangeLog function entries
7e78f0d1b2 Fix void-variable n-reb in re-builder (Bug#40409)
452d776a5d Fix small bug in copy_string_contents.
fa823653ff Fix invocations of gpg from Gnus
d4f51d0a2e Don't draw GTK's internal border and tab bar on top of eac...
38731d504e ; * src/buffer.c (syms_of_buffer) <inhibit-read-only>: Doc...
44ac9e48bb Tweak htmlfontify's generated output

diff --cc lisp/htmlfontify.el
Simple merge

diff --cc src/buffer.c
Simple merge

diff --cc src/emacs-module.c
Simple merge

diff --cc src/xterm.c
Simple merge