Bug 771895 - add 128x128 and 256x256 versions for "folder" icon.
Freedesktop's "Thumbnail Managing Standard" defines 2 standard sizes for thumbnails: 128x128 and 256x256 (section 5.3. Thumbnail Size). Since the "folder" icon is used in-place of thumbnail when selecting a folder in the GTK+ file dialog, it should also provide these default sizes.
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