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Presenter: Add Presentation::has_a_[next,previous]_frame()
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@ -32,6 +32,8 @@ public:
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unsigned current_slide_number() const { return m_current_slide.value(); }
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unsigned current_frame_in_slide_number() const { return m_current_frame_in_slide.value(); }
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bool has_a_next_frame() const;
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bool has_a_previous_frame() const;
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void next_frame();
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void previous_frame();
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void go_to_first_slide();
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