- QAction* action_quit() const;
- QAction* action_view_zoom_in() const;
- QAction* action_view_zoom_out() const;
- QAction* action_view_zoom_fit() const;
- QAction* action_view_zoom_one_to_one() const;
- QAction* action_view_show_cursors() const;
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- void session_error(const QString text, const QString info_text);