The BaseWidget.style field now has to be assigned using an array literal (e.g. style = [ButtonSuggested])
instead of using a set literal (e.g. style = {ButtonSuggested}). This change was necessary in order to support
custom CSS classes. You can add custom CSS classes to widgets like this: style = [StyleClass("my-css-class")].
FileChooserDialogState.filename has been deprecated. Use filenames instead.
The {.internal.} pragma has been removed. Use {.private.} instead.
Contrary to {.internal.}, {.private.} actually does not export the given field.
The WindowSurface widget was renamed to AdwWindow. This change was made as part of introducing a new naming scheme where Adwaita widgets with identically named counterparts in GTK will receive the Adw prefix to avoid name collisions.
The compiler flag -d:adwaita12 was removed. Use -d:adwminor=<MINOR_VERSION_NUMBER> (defaults to 0) and/or -d:adwmajor=<MAJOR_VERSION_NUMBER> (defaults to 1) instead. This change was necessary to allow more fine-grained control over which Adwaita features are available when compiling for a specific adwaita version.
The compiler flag -d:gtk48 was removed. Use -d:gtkminor=<MINOR_VERSION_NUMBER> (defaults to 0) instead. This change was necessary to allow more fine-grained control over which features are available when compiling for a specific GTK version.
The TextView.changed event has been removed. Use TextBuffer.connectChanged instead.