[gtk] (11 commits) Created branch misc-speedups

[Matthias Clasen <matthiasc src gnome org>]

The branch 'misc-speedups' was created.

Summary of new commits:

  466d33c... ngl: Speed up clipping calculations a bit
  f88efb8... ngl: Reduce type checking overhead
  7fb1389... gsk: Add a private getter for container children
  b695ef9... gsk: Add a shortcut for a common transform case
  0ef1219... gsk: Optimize gsk_transform_to...
  ae3e586... gridlayout: Avoid some unnecessary overhead
  98986a2... layoutmanager: Avoid some overhead
  7044951... widget: Avoid GObject data for action muxer
  ee6491f... widget: Avoid some unnecessary back-and-forth casting
  0d8dd0c... sizerequest: Keep branches in sync
  d764603... sizerequest: Simplify some code