[gtk] (8 commits) Non-fast-forward update to branch mask-nodes

[Matthias Clasen <matthiasc src gnome org>]

The branch 'mask-nodes' 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:

  9ea3899... Introduce mask nodes
  7ec44c6... gl: Add a shader for mask nodes
  310dccf... wip: Render fill nodes using a mask shader
  1abfb04... wip: Do the same for stroke nodes
  ed9e2a7... Move the mask creation to the renderer

Commits added to the branch:

  1e1e58c... stroke: Fix gsk_stroke_equal
  bd180f5... Introduce mask nodes
  181fbd2... gl: Add a shader for mask nodes
  9b18b55... Render fill and stroke nodes using the mask shader
  be8fa5c... Add gsk_path_get_stroke_bounds
  a3f27bc... gsk: Use stroke bounds in the stroke node
  9135288... gl: Add a path cache
  38c5a8b... Use the path cache for fill and stroke nodes