[gtk] (9 commits) Non-fast-forward update to branch modern-testsuite

[Benjamin Otte <otte src gnome org>]

The branch 'modern-testsuite' 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:

  e9651ca... testsuite: remove box-order test
  d494e29... reftests: Use GdkTexture instead of cairo_surface_t
  4477498... testuite: Add opacity-overdraw test
  72f81db... reftests: Make diff pixels always opaque
  bc86fd7... reftests: Use the GL renderer
  ed465da... ngl: Fix opacity handling

Commits added to the branch:

  93d95f9... API: Add gdk_texture_new_from_filename()
  c411e8a... testsuite: remove box-order test
  f8411f6... reftests: Make diff pixels always opaque
  0898ece... reftests: Use GdkTexture instead of cairo_surface_t
  8a4d588... ngl: Fix opacity handling
  4a824c6... testuite: Add opacity-overdraw test
  856154f... reftests: Use the GL renderer
  cb0e32e... tests: Update rendernode test to use textures
  cae1abd... testsuite: Port compare_render() to use textures