3.4.1: * Entry, ComboBox sections: Adapt because Entry::signal_activate() has been undeprecated. (Kjell Ahlstedt) Bug #655489, comment 21. * Memory management chapter: Improve the Widgets section. (Kjell Ahlstedt) Bug #678566. * Signals Appendix: Mention exceptions. (Kjell Ahlstedt) Bug #677104. * ComboBox and Range widgets examples: Set an active ComboBox entry. (Kjell Ahlstedt) * Range Widgets example: Really show a Position combo. (Murray Cumming) * SpinButton example: Fix orientation of vertical boxes. (Kjell Ahlstedt) * Update some screenshots. (Kjell Ahlstedt)