Correctly position #BRbookspine, which is acutually the gutter image. As we progress through the book, the position of the gutter changes, along with the size of the left and right leaf edges. Also, no longer set the page border in prepareFlipLeftToRight().
Correctly position #BRbookspine, which is acutually the gutter image.
As we progress through the book, the position of the gutter changes,
along with the size of the left and right leaf edges.
Also, no longer set the page border in prepareFlipLeftToRight().

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