Commits on Aug 29, 2020

1. Use icon theme instead of Gtk::Arrow …

   GTK4で廃止される`Gtk::Arrow`のかわりにアイコンテーマを使います。
   
   GtkArrowのリファレンス[*]より
   > GtkArrow has been deprecated; you can simply use a GtkImage with
   > a suitable icon name, such as "pan-down-symbolic".
   
   非推奨のシンボルを無効化するマクロ
   ```
   GDK_DISABLE_DEPRECATED
   GTK_DISABLE_DEPRECATED
   GDKMM_DISABLE_DEPRECATED
   GTKMM_DISABLE_DEPRECATED
   GIOMM_DISABLE_DEPRECATED
   GLIBMM_DISABLE_DEPRECATED
   ```
   
   コンパイラのレポート
   ```
   ../src/skeleton/tabswitchbutton.h:20:14: error: 'Arrow' in namespace 'Gtk' does not name a type
      20 |         Gtk::Arrow m_arrow{ Gtk::ARROW_DOWN, Gtk::SHADOW_NONE };
         |              ^~~~~
   ../src/skeleton/menubutton.h:28:14: error: 'Arrow' in namespace 'Gtk' does not name a type
      28 |         Gtk::Arrow* m_arrow;
         |              ^~~~~
   ```
   
   [*]: https://developer.gnome.org/gtk3/stable/GtkArrow.html

   

   ma8ma committed Aug 29, 2020
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