Change CairoWidget::get_active() to be const
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@ -54,7 +54,7 @@ public:
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that only use the Active and Normal active states.
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*/
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void set_active (bool);
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bool get_active () { return active_state() != Gtkmm2ext::Off; }
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bool get_active () const { return active_state() != Gtkmm2ext::Off; }
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/* widgets can be told to only draw their "foreground, and thus leave
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in place whatever background is drawn by their parent. the default
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