3.0.0

• New Widgets
  • Grid, Fixed
  • ListView, ColumnView
  • RadioGroup, Calendar, SpinButton
  • Spinner (by @SirOlaf), LevelBar
  • adw.AboutWindow (with major additions by @nylki)
• All of the following widgets were wrapped by @PhilippMDoerner. Thank you very much!
  • CenterBox, ActionBar, Expander
  • SearchEntry, PasswordEntry, EditableLabel
  • Scale, EmojiChooser
  • ProgressBar
  • Video, MediaStream and MediaControls
  • libadwaita
    • adw.OverlaySplitView, adw.PreferencesPage, adw.Banner
    • adw.PasswordEntryRow, adw.SwitchRow
    • adw.StatusPage
• Support custom CSS classes (by @PhilippMDoerner)
• The new owlkettle/playground module automatically generates interactive controls for all fields of a widget and allows you to quickly experiment with the functionality of widgets. It is already integrated into most widget examples. (by @PhilippMDoerner)
• Load CSS Stylesheets from Strings
• Add Window.fullscreened field (by @aleksrutins)
• Allow selecting multiple files in FileChooserDialog
• Add private and onlyState modifiers
• Fix memory leaks (by @PhilippMDoerner)
• Add startupEvents and shutdownEvents (by @PhilippMDoerner)
• Documentation
  • nimibook Documentation Website (by @PhilippMDoerner)
  • Windows Installation Instructions (by @RickBarretto and @michaelsbradleyjr)
  • Documentation for wrapping new widgets (by @PhilippMDoerner)
  • Application Architecture Guide

A migration guide with a list of breaking changes can be found here.