[gtk] (2 commits) Non-fast-forward update to branch matthiasc/css-change-tracking

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/css-change-tracking' 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:

  27c7357... css: Avoid computing change too often

Commits added to the branch:

  2c231f4... Revisit gtk_css_style_get_static_style one more time (*)
  789f6f3... css: Avoid computing change too often

(*) This commit already existed in another branch; no separate mail sent