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If you reread this thread you will see that making any other drag and drop change that is consecutive seems to fix this problem. Note: this is a well known Qt limitation in their QStandardItemModel and has been even back to Qt5.
You were probably just lucky to always have your last drag and drop be consecutive which force removes any duplication but the duplication was still there prior to that. Again, all of BookBrowser drag and drop code is internal code in Qt's QStandardItemModel.
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