ImageViewIcon: Use CSS styling instead of depreacted function #1004
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画像ビューのアイコン背景色切り替えを更新して廃止予定の
Gtk::Widget::override_background_color()
をCSSによる設定に置き換えます。選択されたアイコンの背景色は
$XDG_CONFIG_HOME/gtk-3.0/gtk.css
にCSSセレクタ#jdim-imageview-icon.selected
の設定を追加することで変更できます。(テスト用のため変更の可能性がある)