[libadwaita] (12 commits) Non-fast-forward update to branch wip/exalm/view-switcher-button

[Christopher Davis <christopherdavis src gnome org>]

The branch 'wip/exalm/view-switcher-button' 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:

  b39e83a... demo: Add mnemonics to the view switcher example
  7173467... view-switcher-button: Only set mnemonic for the visible lab

Commits added to the branch:

  92d8a81... _sidebars.scss: Remove backround from .view w/ navigation-s (*)
  a4bf044... avatar: Make custom images fill the circle (*)
  1772651... _lists.scss: Remove listview.content (*)
  80445e1... stylesheet: Add .boxed-list and swap uses of .content (*)
  e7c7ae5... doc: Mention that .content and .boxed-list are unsupported  (*)
  675ff12... demo: Fix a g_autofree warning in CI (*)
  d79d11f... tab: Remove hover state handling (*)
  a7122bb... tab: Show close button on enter as well (*)
  4e2ef2f... tab-box: Handle middle click on release instead of press (*)
  29e1b59... stylesheet: Style GtkWindowControls icon properly (*)
  0089a69... demo: Add mnemonics to the view switcher example
  2d72970... view-switcher-button: Only set mnemonic for the visible lab

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