[gtk] (4 commits) Non-fast-forward update to branch columnview-reorder-cells

[Matthias Clasen <matthiasc src gnome org>]

The branch 'columnview-reorder-cells' 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:

  2788277... columnviewlayout: Handle for_size propertly
  10a3eb3... listitemwidget: Add api to reorder children
  bd4901a... columnviewcolumn: Add private api to set the position
  8ec3690... columnview: Update column positions on reordering

Commits added to the branch:

  40f6a9d... columnviewlayout: Handle for_size propertly (*)
  15c6ad8... listitemwidget: Add api to reorder children
  6df489d... columnviewcolumn: Add private api to set the position
  f631e0e... columnview: Update column positions on reordering

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