[gtk] (14 commits) Non-fast-forward update to branch wip/matthiasc/css-values

[Matthias Clasen <matthiasc src gnome org>]

The branch 'wip/matthiasc/css-values' 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:

  f4b4b8d... css: Move border-width special cases out of GtkCssDimension
  333d8c6... testsuite: Update css color output
  c15f44f... cssvalue: Add is_computed flag
  d617388... cssvalue: Don't call compute() for already computed css val
  b8bb14d... css: Set the is_computed flag for more values
  8dcd99c... cssimage: Add is_computed vfunc
  03943bc... css: Simplify default values
  f2af23a... css: Mark transform value as computed
  326f73e... css: Handle initial values more efficiently
  2bb9702... Remove an unnecessary check
  ec42186... css: Compute selector tree changes ahead of time
  f847038... css: Implement the superset matcher smarter

Commits added to the branch:

  c687f48... css: Move border-width special cases out of GtkCssDimension (*)
  6b6f085... testsuite: Update css color output (*)
  a3a71c1... cssvalue: Add is_computed flag (*)
  ab78c19... cssvalue: Don't call compute() for already computed css val (*)
  ab868a3... css: Set the is_computed flag for more values (*)
  c2e680f... cssimage: Add is_computed vfunc (*)
  d3ad970... csscolorvalue: check for singletons in new_literal (*)
  23cadf0... css: Simplify default values
  87787bd... css: Mark transform value as computed
  47f8095... css: Handle initial values more efficiently
  2bab057... Remove an unnecessary check
  92950ce... css: Compute selector tree changes ahead of time
  79d5330... css: Implement the superset matcher smarter
  212c6b5... css: Faster matching for simple selectors

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