[libadwaita] (6 commits) Non-fast-forward update to branch wip/exalm/deprecation

[Adrien Plazas <aplazas src gnome org>]

The branch 'wip/exalm/deprecation' 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:

  96f16e1... tab-box: Use gtk_drop_target_get_current_drop() instead of 

Commits added to the branch:

  1d5340b... avatar: Fix memory leaks (*)
  2c81acd... demo-window: Fix a memory leak (*)
  8555174... stylesheet: Fix slider for scale.marks-before.marks-after (*)
  d67535c... tests: add test for model correctness (*)
  f6302c0... tab-view: delay notify::selected-page until after setting (*)
  267f072... tab-box: Use gtk_drop_target_get_current_drop() instead of 

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