[pango] (23 commits) ...Merge branch 'serialization-improvements' into 'main'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  1b73b50... Fix visible space handling (*)
  c337145... Cosmetics (*)
  6349912... Rename the serialize errors (*)
  12a46f6... Refactor enum serialization error handling (*)
  c1f9c9f... Add flags to serialize and deserialize (*)
  b9ed027... Allow serializing context information (*)
  4d296ae... serializer: Cosmetics (*)
  8d680a6... More context serialization work (*)
  37d413c... pango-view: Deserialize context too (*)
  c4fe95c... Add a way to get the font matrix (*)
  3f6f288... Optionally serialize output (*)
  9a63774... Update test-layout (*)
  2b013d4... serializer: Support a "comment" field (*)
  becb4a9... Add more tests (*)
  580ad90... Add pango_font_serialize (*)
  9770b4a... serializer: Include unknown glyphs count (*)
  5f539a0... test-layout: Drop the --show-font option (*)
  cddd173... Make test-layout use included fonts (*)
  05be686... Add a newline to serialization results (*)
  4be5684... test-layout: Use an fc fontmap (*)
  2931d89... test-layout: Fix up comparison direction (*)
  553eac2... Skip test-layout on macOS (*)
  f37d293... Merge branch 'serialization-improvements' into 'main'

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