Derive TaskFilterModel from QAbstractItemModel not TaskModel

Change-Id: Ic748ada71e46811a05ced52ea7b1172ad02eb2ee
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/projectexplorer/taskmodel.cpp

@@ -311,7 +311,7 @@ void TaskModel::setFileNotFound(const QModelIndex &idx, bool b)
 // TaskFilterModel
 /////
 
-TaskFilterModel::TaskFilterModel(TaskModel *sourceModel, QObject *parent) : TaskModel(parent),
+TaskFilterModel::TaskFilterModel(TaskModel *sourceModel, QObject *parent) : QAbstractItemModel(parent),
     m_sourceModel(sourceModel)
 {
     Q_ASSERT(m_sourceModel);

src/plugins/projectexplorer/taskmodel.h

@@ -128,7 +128,7 @@ private:
     QFont m_lineMeasurementFont;
 };
 
-class TaskFilterModel : public TaskModel
+class TaskFilterModel : public QAbstractItemModel
 {
     Q_OBJECT