[libadwaita] (6 commits) Non-fast-forward update to branch wip/exalm/needs-attention

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/needs-attention' 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:

  043f613... example: Update view switcher demo icons
  ccfea78... Add AdwIndicatorBin
  a5cdb06... view-switcher: Don't set needs-attention class on buttons
  4b3af1a... view-switcher-button: Reimplement indicator as a widget

Commits added to the branch:

  c1e4dad... stylesheet: Special case colors for all flat buttons in hea (*)
  d5d2851... view-switcher: Use .flat buttons (*)
  5cb6a85... example: Update view switcher demo icons
  d554777... Add AdwIndicatorBin
  366a218... view-switcher: Don't set needs-attention class on buttons
  5f7c899... view-switcher-button: Reimplement indicator as a widget

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