[libadwaita] (11 commits) Non-fast-forward update to branch wip/exalm/combo-row-fixes

[Adrien Plazas <aplazas src gnome org>]

The branch 'wip/exalm/combo-row-fixes' 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:

  eb8566f... combo-row: Fix subtitles when the model has 0 items
  b9f0281... combo-row: Refresh subtitle when setting expression

Commits added to the branch:

  2a28bce... stylesheet: Fix legacy dialog action area (*)
  64077db... stylesheet: Split dialog styles into a separate file (*)
  dad2e49... stylesheet: Move the devel headerbar style to a nested widg (*)
  a7636b0... stylesheet: Restore a backdrop state for header bar (*)
  736a9ea... stylesheet: Tone down the devel style (*)
  37fc4cb... stylesheet: Add back a backdrop state for AdwTabBar (*)
  215f9a1... stylesheet: Add a prominent border for color swatches in HC (*)
  6e75a1f... stylesheet: Fix the focus ring opacity in HC (*)
  8de5213... leaflet: Null check visible child in find_swipeable_page() (*)
  ee11d4d... combo-row: Fix subtitles when the model has 0 items
  380a528... combo-row: Refresh subtitle when setting expression

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