[libhandy] (28 commits) Non-fast-forward update to branch unstable-api

[Adrien Plazas <aplazas src gnome org>]

The branch 'unstable-api' 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:

  6f19199... Remove the HANDY_USE_UNSTABLE_API guard
  017c4b4... doc: Tell to stop acknowledging the API unstability
  96601f6... Forbid using HANDY_USE_UNSTABLE_API

Commits added to the branch:

  ce1c771... Replace .preferences with .content (*)
  1d140cf... swipe-tracker: Reset state on unrealizing (*)
  afd86e3... themes: Reshuffle window outline (*)
  a7636be... Introduce HdyCarouselIndicatorDots (*)
  ea3c413... Introduce HdyCarouselIndicatorLines (*)
  f4a65f5... Cross-reference carousel-related widgets (*)
  e02e993... examples: Use the new carousel indicator widgets (*)
  181f2f5... carousel: Remove indicators (*)
  ca9430d... doc: Mention carousel changes in the migration guide (*)
  2e37d49... themes: Bump the required GTK to 3.24.21 (*)
  6250b29... keypad: Set some default row and column spacing (*)
  b1678f2... Add CSS sizing helpers for measure() and size_allocate() (*)
  4eb6c02... header-bar: Use the CSS sizing helpers (*)
  aa96c2d... view-switcher: Use the CSS sizing helpers (*)
  5b393e3... themes: Give margins to title view switchers (*)
  3af5cb1... view-switcher-bar: Drop the icon-size property (*)
  d6c736d... view-switcher-title: Drop the icon-size property (*)
  218de13... view-switcher: Drop the icon-size property (*)
  b85540c... Trim gitattributes (*)
  0a439c5... squeezer: Use the CSS sizing helpers (*)
  ab4d632... header-bar: Refine mobile window detection (*)
  7330286... Update POTFILES.in (*)
  12e9736... Add British English translation (*)
  6628085... preferences-window: Set a default size and a minimum width (*)
  5d0e8e8... demo: Use the default HdyPreferencesWindow sizes (*)
  40912a5... combo-row: Special case single item models (*)
  cf06b86... Remove the HANDY_USE_UNSTABLE_API guard
  f2a27b4... doc: Tell to stop acknowledging the API unstability

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