[libadwaita] (16 commits) ...stylesheet: Brighten accent color for dark variant

[Alexander Mikhaylenko <alexm src gnome org>]

Summary of changes:

  1097a57... stylesheet: Use lighter active states (*)
  f1eeb94... stylesheet: Unify spinbutton styles (*)
  f6196e9... stylesheet: Remove redundant osd button special cases (*)
  e5b40ec... stylesheet: Remove a trailing blank line (*)
  9015fb6... stylesheet: Use flat button style for calendar header (*)
  bb5ad30... stylesheet: Transparentize disabled buttons (*)
  da4ec19... stylesheet: Add a selected+active view color (*)
  66dd0c4... stylesheet: Remove special osd image button styles (*)
  5a6e8ce... stylesheet: Add linebreaks in _colors.scss (*)
  9028bde... stylesheet: Redo the message dialog action area (*)
  ef0b1a9... stylesheet: Rework .linked (*)
  4133dfd... stylesheet: Use currentColor instead of text color (*)
  50ba8d2... stylesheet: Overhaul button styles (*)
  31e6473... stylesheet: Lighten up entry borders (*)
  e3b3120... stylesheet: Lighten header bar (*)
  f61a914... stylesheet: Brighten accent color for dark variant (*)

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