When the editing data's art is rejected (another page size, art the page
doesn't draw, too many text objects…), the file still comes in as its page,
but now on a layer above the editing data's layers. They come in empty, in
their order, with their names, visibility, lock, print option and sublayers.
The page's layer takes a free name when the file's layers have its Layer 1.
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6661f2419b