[gtk] (3 commits) Non-fast-forward update to branch wip/otte/center-center-center

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/center-center-center' 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:

  0820a77... reftests: Add a test for label sizing
  545fe3e... reftests: Don't crash if no node
  37cb619... testsuite: Add lots of reftests for picture sizing

Commits added to the branch:

  f6ec97f... reftests: Add tests for label sizing
  e8bc5dc... reftests: Don't crash if no node
  255208d... testsuite: Add lots of reftests for picture sizing