[libadwaita] (14 commits) Non-fast-forward update to branch wip/exalm/backdrop

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/backdrop' 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:

  16cce03... stylesheet: Remove treeview backdrop styles
  1079039... stylesheet: Remove redundant popover:backdrop style
  6964d4d... stylesheet: Remove a backdrop-specific rule for notebook
  30e23a5... stylesheet: Use opacity for caps lock indicator instead of 
  e0abe62... stylesheet: Drop status page backdrop style

Commits added to the branch:

  fcf017f... stylesheet: Remove treeview backdrop styles
  3224427... stylesheet: Remove redundant popover:backdrop style
  527d0a0... stylesheet: Remove a backdrop-specific rule for notebook
  56d97f3... stylesheet: Use opacity for caps lock indicator instead of 
  33548ad... stylesheet: Drop status page backdrop style
  e764a47... stylesheet: Drop unused backdrop overshoot glow
  782ffa9... stylesheet: Drop scale backdrop specificity bumps
  2f517b6... stylesheet: Remove entry backdrop specificity bumps
  74927f7... stylesheet: Drop backdrop state for selection mode checks
  2f02695... stylesheet: Drop unused backdrop check styles
  fefd2e9... stylesheet: Drop backdrop style for buttons
  1e02b1d... stylesheet: Transparentize header bar contents for backdrop
  a23da23... stylesheet: Remove separate header bar border color for bac
  bbe3975... stylesheet: Drop public backdrop colors