[gnome-control-center] (29 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:

  28c2205... background: start implementing the new design for the backg
  5fd663e... background: change margin around background preview to 16
  f1c961d... background: add buttons on bottom of gallery without functi
  a278d64... background: fix border on top of the gallery and add ids fo
  f6d22d6... background: add handler for "Photo" and "Files" button
  1ae76c4... background: clean up and fix build warnings
  821e8cb... background: clear settings object in dispose
  4487efa... background: resize preview when the window size is less the
  e4de4ca... background: add slide icon to time changing wallpapers
  a687c65... background: add space around slide icon
  8e61971... background: change margins for preview to 16px
  3e3704f... background: change size of preview when panel is heigher th
  1157bad... background: resize thumbnail to fill space a row
  fe91ed5... background: change gallery wallpaper size
  0ffe9a6... background: use same margin size everywhere around the flow
  c062d17... background: add icon for with time changing wallpapers
  6061926... background: moved gallery item code to grid-item class
  9c2c17f... background: add white space around gallery, set min itmes p
  bb01424... background: set max children for line to 5
  7bc1fd8... background: set wallpaper and lockscreen
  928526d... background: fix code style issues and remove commented code
  81251d8... background: fix build warning by casting obj to gtkWidget
  e6d8870... background: remove private struct of cc-background-store
  677b694... background: remove CcBackgroundStore constructer
  be921cb... background: make cc_background_grid_item_set_ref static and
  aef3dd7... background: change name cc_background_grid_item_get_ref
  768c4ee... background: less exposure of the the wallpaper store
  085abbe... background: change base obj of CcBackgroundGridItem
  03f589b... background: CcBackgroundGridItem::new returns its own typ
  1fcc795... background: cache tumbnail for wallpaper gallery for a redr
  f3bd827... background: changed variable names and small style changes
  bb76214... background: cache slideshow-emblem icon
  6d2aa7d... background: show only top border for gallery view
  ea3cd32... background: remove chooser gallery from meson.build (needs 
  dac551e... background: adapt meson.build for file changes
  9250bc6... background: remove old source files and images form git
  86414b3... background: change description for open in File and open in
  5b0c849... background: fix merge mistakes created during rebase
  fa9e3f2... background: fix crash of g-c-c by opening gnome-photos
  a902684... background: use autoptr where possible
  59c0a6a... background: remove bg-source and bg-wallpapers-source files
  8f1f63e... background: fix code style and spaces
  bcafc61... background: fix code style: remove empty line
  40eb86f... background: add Julian Sparber as author to cc-background-p
  3c0b9bc... background: fix build warning: set slideshow_emblem to NULL

Commits added to the branch:

  efa4f48... background: start implementing the new design for the backg
  c9fd9dc... background: add buttons at bottom the of the gallery
  5bfd141... background: clear settings object in dispose
  ebd94d8... background: resize preview when the window size is less the
  f979def... background: add slide icon to time changing wallpapers
  7f15ff8... background: change margins for preview to 16px
  c28b5f5... background: change size of preview when panel is heigher th
  4f1e2a7... background: expand thumbnails to fill a gallery row
  0a3bdee... background: add icon for with time changing wallpapers
  5335865... background: moved gallery item code to grid-item class
  c557dde... background: add white space around gallery and min/max per 
  333f772... background: set wallpaper and lockscreen
  c986c85... background: clean up code
  391880a... background: refactor cc-background-store
  8e298ab... background: make cc_background_grid_item_set_ref static and
  03f8e8f... background: change name cc_background_grid_item_get_ref
  bc44892... background: less exposure of the the wallpaper store
  d036b5e... background: change base obj of CcBackgroundGridItem
  302c3b4... background: CcBackgroundGridItem::new returns its own typ
  51f0af4... background: cache tumbnail for wallpaper gallery for a redr
  5d78a87... background: changed variable names and small style changes
  3ddbc41... background: cache slideshow-emblem icon
  918d63e... background: show only top border for gallery view
  faa00ef... background: adapt meson.build for file changes
  7d2b961... background: change description for open in File and open in
  7bede3f... background: fix merge mistakes created during rebase
  0c672b9... background: fix crash of g-c-c by opening gnome-photos
  97efb7a... background: use autoptr where possible
  cdce6f8... background: clean up files and code and remove build warnin