[gnome-control-center] (12 commits) Non-fast-forward update to branch wip/jsparber/background

[Julian Sparber <jsparber src gnome org>]

The branch 'wip/jsparber/background' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  2555616... background: add comment: the way of setting the background 
  0bf9e62... background: remove chooser gallery from meson.build (needs 
  5bebef6... background: adapt meson.build for file changes
  4645922... background: remove old source files and images form git
  4303fbe... background: change description for open in File and open in
  1d9bdb1... background: fix merge mistakes created during rebase
  026a471... background: fix crash of g-c-c by opening gnome-photos
  7e3fe59... background: use autoptr where possible
  6af4bd2... background: remove bg-source and bg-wallpapers-source files
  37d3ee8... background: fix code style and spaces
  ed4f468... background: fix code style: remove empty line
  eee85e4... background: add Julian Sparber as author to cc-background-p
  df1e500... background: fix build warning: set slideshow_emblem to NULL

Commits added to the branch:

  139fef6... background: remove chooser gallery from meson.build (needs 
  a621f12... background: adapt meson.build for file changes
  b0f9010... background: remove old source files and images form git
  4191657... background: change description for open in File and open in
  a66a102... background: fix merge mistakes created during rebase
  f644907... background: fix crash of g-c-c by opening gnome-photos
  b35dca0... background: use autoptr where possible
  8b68fe6... background: remove bg-source and bg-wallpapers-source files
  51e482b... background: fix code style and spaces
  22fa770... background: fix code style: remove empty line
  52ed269... background: add Julian Sparber as author to cc-background-p
  9aafc41... background: fix build warning: set slideshow_emblem to NULL