[gtk] (16 commits) Non-fast-forward update to branch emoji-grid

[Matthias Clasen <matthiasc src gnome org>]

The branch 'emoji-grid' 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:

  67c9ac0... testsuite: Add section tests to sortlistmodel test
  044a3d6... sortlistmodel: add a fast path for get_section()
  a4c70b7... listview: Implement ::section-factory property
  257cb90... listview: Split out a function
  fb5b9ed... gridview: Add support for sections
  99e597b... css: Add some CSS for sections
  bda3b34... demo: Add a listview sections demo
  f2cbbfb... gtk-demo: Add a sectioned view to the filebrowser demo
  d2eedd3... testsuite: Add tests for sections to filterlistmodel
  4309b56... gridview: Rework section handling
  4a4d834... Add a test for sortlistmodel sections
  c5275ae... filterlistmodel: Support sections
  4f9a092... Add a test for filterlistmodel sections
  511b832... Add an emoji list
  1615d7e... gtk-demo: Add a sectioned grid

Commits added to the branch:

  83f321a... Add a test for sortlistmodel sections (*)
  a507b2f... testsuite: Add section tests to sortlistmodel test (*)
  e5b4e5c... sortlistmodel: add a fast path for get_section() (*)
  00eebfa... filterlistmodel: Support sections (*)
  0958f6f... Add a test for filterlistmodel sections (*)
  e5dbadb... testsuite: Add tests for sections to filterlistmodel (*)
  228a88f... listview: Implement ::section-factory property (*)
  4a8d5d3... listview: Split out a function (*)
  49616f7... gridview: Add support for sections (*)
  9426761... css: Add some CSS for sections (*)
  2c6ffe6... demo: Add a listview sections demo (*)
  afc2be4... gtk-demo: Add a sectioned view to the filebrowser demo (*)
  dd5fd87... gridview: Rework section handling (*)
  f7d55dd... Add an emoji list
  8690ca4... gtk-demo: Add a sectioned grid
  106ce85... Filter Emoji by font availability

(*) This commit already existed in another branch; no separate mail sent