[libadwaita] (10 commits) ...stylesheet: Extract slider colors

[Adrien Plazas <aplazas src gnome org>]

Summary of changes:

  33aa6c5... stylesheet: Don't darken rubberband color (*)
  f26de3e... stylesheet: Use drag-n-drop color consistently (*)
  81af658... stylesheet: Don't override menu color for HC (*)
  4aa45c0... stylesheet: Drop $top_hilight (*)
  07dec07... stylesheet: Use the focus-ring() mixin for labels (*)
  aa27a61... stylesheet: Nest label styles (*)
  7f5206b... stylesheet: Rename menu_* colors to view_* (*)
  7b88959... stylesheet: Extract trough colors into variables (*)
  20985d2... stylesheet: Extract fill colors (*)
  3435bad... stylesheet: Extract slider colors (*)

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