[gtk] (11 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:

  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
  7d1d3e7... tests: Update rendernode test to use textures
  5a0e078... testsuite: Port compare_render() to use textures
  9589059... reftests: Use 0.6 alpha, not 0.5
  2debc6a... reftests: Use 0.6 instead of 0.5 for alpha
  c4bca35... reftests: Use the GL renderer

Commits added to the branch:

  01edfe8... API: Add gdk_texture_new_from_filename()
  3582a9b... testsuite: remove box-order test
  7a15f22... reftests: Make diff pixels always opaque
  94bf529... reftests: Use GdkTexture instead of cairo_surface_t
  b116a57... ngl: Fix opacity handling
  a5a6ade... testuite: Add opacity-overdraw test
  9c1606e... tests: Update rendernode test to use textures
  27d0f3a... testsuite: Port compare_render() to use textures
  83829c5... reftests: Use 0.6 alpha, not 0.5
  ae81ab5... reftests: Use 0.6 instead of 0.5 for alpha
  7761567... reftests: Use the GL renderer