Xwt.GtkBackend: prototype for MultiLine-TextEntryBackend
Limaki.View.GtkBackend: enable Xwt.GtkBackend.TextEntryBackendMultiLine
Limaki.Drawing.XwtBackend.ContextPainterExtensions.DrawText: track changes in Xwt.Gtk
Xwt.Testing.ReferenceImages: some more