master updated (568920a5b7 -> ad88e3e0b5)

[Stefan Kangas]

skangas pushed a change to branch master.

      from  568920a5b7 Implement font-use-system-font on Haiku
       new  f761869a56 Add :buffer argument to ert-with-temp-file
       new  ad88e3e0b5 Add reasonable default to wallpaper-set


Summary of changes:
 lisp/emacs-lisp/ert-x.el           | 18 +++++++++++++--
 lisp/image/wallpaper.el            | 34 +++++++++++++++++++++-------
 test/lisp/image/wallpaper-tests.el | 46 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 10 deletions(-)
 create mode 100644 test/lisp/image/wallpaper-tests.el