Replace lambda with sigc::mem_fun() for signal connection #903
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sigc::mem_fun()
を使ってメンバー関数をシグナルに接続するように変更します。sigc::trackable
を継承したオブジェクトが破棄されるとき接続が解除されます。https://developer-old.gnome.org/libsigc++/2.10/group__mem__fun.html#details