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I have been reading and trying to understand where in the QStandardItemModel dropMimedata routine in Qt's source, the assumption that it must be contiguous comes into play but do not really see it. That source is quite involved as it must work in any QTreeView structure.
If we are 100% sure a simple single move and back will fix the issue, perhaps we could create a workaround that does that immediately after any drop. It is an idea to explore.
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