*.ico images not fully supported on Open dialog

[alessandrofrancesconi]

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At first when I run the plugin and then try the "Add image button > Add single images...", my .ico files aren't shown. They aren't added if I use: "Add Folders...". My way of coping this was opening all the .ico files in Gimp, then use: "Add all opened images". Now the .ico files were added.