Created frontend for SeriesTreeModel::deleteFromSeries

Implemented frontend for SeriesTreeModel::deleteFromSeries. I hope
QPersistentModelIndexes work as advertised. From the qt-sources it seems
that a QPersistentModelIndex is automatically updated by
QAbstractItemModel when calling begin(Remove|Insert)Rows. Testing worked
out fine.

While at it I found a bug in SmTreeModel. removeRows has to be called
with (i - 1) instead of (i) to remove the correct nodes.

1 files changed, 1 insertions, 1 deletions

diff --git a/smtreemodel.cpp b/smtreemodel.cpp
index 227c1cb..2a230cc 100644
--- a/smtreemodel.cpp
+++ b/smtreemodel.cpp
@@ -153,7 +153,7 @@ bool SmTreeModel::removeRows(int row, int count, const QModelIndex &parent){
 
 	beginRemoveRows(parent, row, row + count - 1);
 	for(int i = row + count; i > row; --i){
-		retval = parentItem->removeChild(i);
+		retval = parentItem->removeChild(i - 1);
 
 	}
 	endRemoveRows();