[libadwaita] (9 commits) Non-fast-forward update to branch wip/exalm/flat-switcher

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/flat-switcher' 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:

  07f2e3c... stylesheet: Special case colors for all flat buttons in hea
  48680af... view-switcher: Use .flat buttons

Commits added to the branch:

  cd6a511... Drop old NEWS (*)
  4ac74ee... stylesheet: Specificity bump for AdwComboRow popovers (*)
  54a50b1... leaflet: Implement select_item() for AdwLeafletPages (*)
  2956cfe... stylesheet: fix solid-csd style (*)
  df8d4e8... demo: Specify .list-button explicitly
  07fc970... stylesheet: Stop styling buttons inside lists
  1aa5432... stylesheet: Rename .list-button to .outline
  09c0058... stylesheet: Special case colors for all flat buttons in hea
  1653e92... view-switcher: Use .flat buttons

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