[libadwaita] (15 commits) Non-fast-forward update to branch wip/exalm/borderless

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/borderless' 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:

  326c68e... stylesheet: Update menu button style
  ed2bfb2... Add AdwSplitButton
  e5d3c05... Add AdwButtonContent
  5cc324a... stylesheet: Remove separator margin for non-menu popovers
  5be0d2c... stylesheet: Extract style for raised buttons
  c7188de... stylesheet: Use toolbar style for header bars and action ba
  b51295a... stylesheet: Reset toolbar styles for popovers
  a465aab... stylesheet: Make GtkWindowControls buttons filled
  547b62f... stylesheet: Make image buttons square
  8548ca0... stylesheet: Specificity bump for spinbutton buttons
  791e572... view-switcher-button: Set spacing in css and match buttons
  8b9e9a8... stylesheet: Add separator.spacer
  b9d76f3... doc: Mention the flat button changes in the migration guide
  7f9bd1b... example: Add a split button+button content page
  fe75dad... example

Commits added to the branch:

  dfc4b7b... stylesheet: Update menu button style
  1415d80... Add AdwSplitButton
  dd556fc... Add AdwButtonContent
  c056a5c... stylesheet: Remove separator margin for non-menu popovers
  45c227b... stylesheet: Extract style for raised buttons
  14c528d... stylesheet: Use toolbar style for header bars and action ba
  aa6dc1d... stylesheet: Reset toolbar styles for popovers
  f67a790... stylesheet: Make GtkWindowControls buttons filled
  c2f2f8f... stylesheet: Make image buttons square
  4e84520... stylesheet: Specificity bump for spinbutton buttons
  4897b6a... view-switcher-button: Set spacing in css and match buttons
  635876b... stylesheet: Add separator.spacer
  6c6109e... doc: Mention the flat button changes in the migration guide
  8e12102... example: Add a split button+button content page
  b4eeb68... example