[pango/matthiasc/for-main] (13 commits) ...Add docs for new attributes

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  e382a65... Make ellipsize code safer (*)
  303b4fb... Implement baseline shifts (*)
  fd51b46... Implement font-dependent scaling (*)
  1b73eed... markup: Change <sup> and <sub> (*)
  1f0b5d5... Add horizontal displacement (*)
  cd390b8... test-layout: Disable fragile checks (*)
  a0cb9d5... test-layout: Add a --show-fonts option (*)
  9232840... Merge branch 'matthiasc/for-main' into 'main' (*)
  54b0d3f... shape: Mark color glyphs in glyphstrings (*)
  7e329ab... test-shape: Show color glyph information (*)
  44e5d0b... Merge branch 'color-glyph' into 'main' (*)
  c1009a2... Merge branch 'baseline-shift' into 'main' (*)
  a6ffe09... Add docs for new attributes

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