[libadwaita] (9 commits) ...tab-box: Fix resize deferring with non-expanded tabs

[Alexander Mikhaylenko <alexm src gnome org>]

Summary of changes:

  227418a... tab-box: Rename overlap to spacing and invert it (*)
  9704505... tab: Place indicator above the label (*)
  2d6e3ab... tab-box: Never scroll on click if the tab bar doesn't scrol (*)
  b97ade9... fade: Add width params (*)
  6528350... tab-box: Refresh design (*)
  b6e64f2... tab-box: More descriptive css name for tab containers (*)
  c53e21d... tab: Use selected state instead of checked (*)
  c875997... stylesheet: Add a backdrop style for tabs (*)
  8759071... tab-box: Fix resize deferring with non-expanded tabs (*)

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