Implement MappingTreeWidget

This is a rather large commit. It implements MappingTreeWidget using
MappingTreeModel unsurprisingly this uncovered some exciting bugs.

Fixes the following bugs in MappingTreeModel:
* use insertRows() and removeRows() when addings children, because
dataChanged() won't do it.
* don't use a prepared QSqlQuery when fetching children recursively.
This won't work because the query is still active when we invoke
ourselves again. Put the query on the stack instead
* Keep the model sorted.

Also add an entry for a MappingTreeEditor to the File-Menu.

1 files changed, 3 insertions, 2 deletions

diff --git a/smtreemodel.cpp b/smtreemodel.cpp
index 86d2b77..98e7e45 100644
--- a/smtreemodel.cpp
+++ b/smtreemodel.cpp
@@ -40,9 +40,10 @@ int SmTreeModel::columnCount(const QModelIndex &parent) const{
 }
 
 QModelIndex SmTreeModel::index(int row, int column, const QModelIndex &parent) const{
-	if(parent.isValid() && (parent.column() != 0)){
+    //this is totally bogus! Why? Tentatively leaving it in for now...
+    if(parent.isValid() && (parent.column() != 0)){
 		return QModelIndex();
-	}
+    }
 	SmTreeItem *parentItem = itemAt(parent);
 	SmTreeItem *childItem = parentItem->child(row);
 	if(childItem){