[libadwaita] Non-fast-forward update to branch wip/exalm/leaflet-fix

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/leaflet-fix' 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:

  e36a892... leaflet: Null check in find_swipeable_page()

Commits added to the branch:

  1526d9d... leaflet: Null check visible child in find_swipeable_page()