[gtk] (16 commits) ...Merge branch 'wip/otte/boxes' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  e0ec5ca... container: Drop gtk_container_check_resize() (*)
  d3a2218... widget: Split up priv->allocation (*)
  d65a60e... widget: Move compuatation of what changed further up (*)
  2e5bc9f... gtk: Add the GtkRoot interface (*)
  aeda099... widget: Remove toplevel flag (*)
  4ca1f7e... widget: Add GtkWidgetClass:root and :unroot functions (*)
  ddf2a36... widget: Add a GtkWidget::root property and gtk_widget_get_r (*)
  2fbdd8b... root: Add GtkRoot:get_display vfunc (*)
  446713f... root: Add gtk_root_get_surface_transform() (*)
  694d7c3... root: Move the renderer to the root (*)
  86978d2... widget: Store the render node in the widget's coordinate sy (*)
  19ffb40... cssboxes: Introduce (*)
  285aba6... widget: Make width, height and transform be widget-relative (*)
  7ad0f7f... css: Mark some hot functions as G_GNUC_PURE (*)
  c44c44e... css: Pass boxes to the render functions (*)
  bea1a02... Merge branch 'wip/otte/boxes' into 'master'

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