[libadwaita] (10 commits) ...stylesheet: Remove a treeview checkbutton special case

[Alexander Mikhaylenko <alexm src gnome org>]

Summary of changes:

  7ba992a... stylesheet: Tone down selected menu item style for dark (*)
  7f348a0... stylesheet: Refine .navigation-sidebar row styles (*)
  24b3c99... stylesheet: Remove redundant stack sidebar styles (*)
  8ce6fa0... stylesheet: Specificity bump for dropdowns (*)
  970b29a... stylesheet: Fix mix() usage in list.content styles (*)
  73502bf... stylesheet: Simplify list styles (*)
  85e848f... stylesheet: Remove blue from view selections (*)
  af9e543... stylesheet: Fix places sidebar dnd style (*)
  fb34e7f... stylesheet: Fix indentation in treeview styles (*)
  11c618a... stylesheet: Remove a treeview checkbutton special case (*)

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