[gtk] (8 commits) Non-fast-forward update to branch wip/baedert/single-node-window

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/single-node-window' 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:

  eb42439... widget: Remove GtkWindow special case in create_render_node
  4dc8fd6... widget: Make 1 if out of 2 ifs
  4ddb6bb... window: Remove custom snapshot() implementation
  60f2b3e... window: Don't care about shadow in size_allocate()
  07dd661... window: Don't care about shadow in measure()
  ccccacd... window: Remove decoration node
  f56a710... /o\

Commits added to the branch:

  9a5d706... treeview: connect css nodes before connecting widgets
  7df12e2... widget: Remove GtkWindow special case in create_render_node
  3e1917b... widget: Make 1 if out of 2 ifs
  8841041... window: Remove custom snapshot() implementation
  738e62f... window: Don't care about shadow in size_allocate()
  f603df0... window: Don't care about shadow in measure()
  adf8d63... window: Remove decoration node
  05b96ba... /o\