[libadwaita] (18 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:

  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

Commits added to the branch:

  04bf2cf... Added Lithuanian translation (*)
  36e690f... Czech translation (*)
  ca9256a... Add Galician translation (*)
  79eab98... stylesheet: Update menu button style
  167ec12... Add AdwSplitButton
  31f369a... Add AdwButtonContent
  3b34646... stylesheet: Remove separator margin for non-menu popovers
  5c8a61f... stylesheet: Extract style for raised buttons
  47a9d0d... stylesheet: Use toolbar style for header bars and action ba
  6050352... stylesheet: Reset toolbar styles for popovers
  0d17659... stylesheet: Make GtkWindowControls buttons filled
  288f438... stylesheet: Make image buttons square
  5a63787... stylesheet: Specificity bump for spinbutton buttons
  9d49349... view-switcher-button: Set spacing in css and match buttons
  19d8739... stylesheet: Add separator.spacer
  8c7f20d... doc: Mention the flat button changes in the migration guide
  1c26f79... example: Add a split button+button content page
  ba8485b... example

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