[gtk] (5 commits) Non-fast-forward update to branch arnaudb/better-substitution

[Arnaud B. <arnaudb src gnome org>]

The branch 'arnaudb/better-substitution' 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:

  5db5e39... Fix a gtk-builder-tool substitution.
  e8b2aff... Fix --3to4 tests for margin substitution.
  ac30162... Replace also margin-left and margin-right.
  7e30661... Fix tests for margin-left and margin-right.
  3b0b1f5... Fix tests for hexpand and vexpand.

Commits added to the branch:

  17ec74d... Fix a gtk-builder-tool substitution.
  ed362fc... Fix --3to4 tests for margin substitution.
  a7218da... Fix tests for hexpand and vexpand.
  11a43cf... Replace also margin-left and margin-right.
  e76dee0... Fix tests for margin-left and margin-right.