I have a model/view system where I am attempting to implement drag and drop. The actual drag and drop seems to be operating correctly... but the model::removeRows() function doesn't appear to be working as documented.

Here's an example... take the tree describe below

Qt Code: 
  1. rootnode
  2.  |
  3.  |----A
  4.  |----B
  5.  |----C
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I can drag C to go under B, but QtGui calls removeRows() with C as the parent, rather than rootnode (invalid QModelIndex).

the relevant code:
Qt Code: 
  1. bool modelPlugins::removeRows(int row, int count, const QModelIndex & parent)
  2. {
  3.    int index(0);
  4.    modelPluginItem * parentItem;
  5.    if(row < 0 || row + count > rowCount(parent))
  6.       return false;
  7.    if(parent.isValid())
  8.       parentItem = static_cast<modelPluginItem *>(parent.internalPointer());
  9.    else
  10.       parentItem = rootItem;
  11.    beginRemoveRows(parent, row, row + count - 1);
  12.    for(; index < count; index++)
  13.       parentItem->nondestructiveremovechild(row);
  14.    endRemoveRows();
  15.    return true;
  16. }
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In my debugger, the modelPluginItems each have a unique id... the root node has ID 0, and C has ID 3... parentItem has ID 3. I can see this if Qt were to attempt to remove all children before removing the item, but it never tries to remove row 2 with an invalid parent index. How can I fix this?