Merge branch 'master' of git.sv.gnu.org:/srv/git/emacs into feature/pgtk

diff --cc Makefile.in
Simple merge

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

diff --cc lisp/frame.el
Simple merge

diff --cc lisp/mwheel.el
Simple merge

diff --cc lisp/startup.el
Simple merge

diff --cc src/image.c
Simple merge

diff --cc src/xdisp.c
Simple merge