[clutter] (8 commits) Created branch wip/optimizations-2

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'wip/optimizations-2' was created.

Summary of new commits:

  8817c0f... Clean up the Actor private header
  b929021... actor: Keep track of clones
  6d1a46b... actor: Ignore redraws queued on unmapped actors
  c1a7ec2... actor: Clean up internal add/remove functions
  57badcb... actor: Propagate the cloned state to the children
  242561b... actor: Skip transitions on invisible actors
  b139815... examples/layout-manager: Improve the example
  b34234e... actor: Skip queuing relayouts on unmapped actors