[gtk] (11 commits) ...Merge branch 'css-line-height2' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  d923402... css: Add line-height property (*)
  ae767dc... css: Translate line-height to a Pango (*)
  8b2f28e... css: Add parser tests for line-height (*)
  bbd2b25... css: Document line-height as supported (*)
  66b297e... textview: Add line height plumbing (*)
  4759afc... textview: Set line height from css (*)
  2cc06f6... textview: Set line height from markup (*)
  a9003f7... gtk-demo: Set line height from markup (*)
  e3df89b... gtk-demo: Improve markup demo (*)
  6c19a83... gtk-demo: Add a line height demo (*)
  383ea0d... Merge branch 'css-line-height2' into 'master'

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