libtaskmanager: Port to QConcatenateTablesProxyModel for ConcatenateTasksProxyModel

Add source model before connecting to model signals to avoid crashes.

libtaskmanager/concatenatetasksproxymodel.cpp

@@ -9,7 +9,7 @@
 namespace TaskManager
 {
 ConcatenateTasksProxyModel::ConcatenateTasksProxyModel(QObject *parent)
-    : KConcatenateRowsProxyModel(parent)
+    : QConcatenateTablesProxyModel(parent)
 {
 }
 

libtaskmanager/concatenatetasksproxymodel.h

@@ -8,7 +8,7 @@
 
 #include "abstracttasksproxymodeliface.h"
 
-#include <KConcatenateRowsProxyModel>
+#include <QConcatenateTablesProxyModel>
 
 #include "taskmanager_export.h"
 
@@ -17,13 +17,13 @@ namespace TaskManager
 /**
  * @short A proxy tasks model for concatenating multiple source tasks models.
  *
- * This proxy model is a subclass of KConcatenateRowsProxyModel implementing
+ * This proxy model is a subclass of \QConcatenateTablesProxyModel implementing
  * AbstractTasksModelIface, forwarding calls to the correct source model.
  *
  * @author Eike Hein <hein@kde.org>
  **/
 
-class TASKMANAGER_EXPORT ConcatenateTasksProxyModel : public KConcatenateRowsProxyModel, public AbstractTasksProxyModelIface
+class TASKMANAGER_EXPORT ConcatenateTasksProxyModel : public QConcatenateTablesProxyModel, public AbstractTasksProxyModelIface
 {
     Q_OBJECT
 

libtaskmanager/tasksmodel.cpp

@@ -152,10 +152,14 @@ void TasksModel::Private::initModels()
     //     -> flattenGroupsProxyModel (optionally, if groupInline == true) flattens groups out.
     //      -> TasksModel collapses (top-level) items into task lifecycle abstraction; sorts.
 
+    concatProxyModel = new ConcatenateTasksProxyModel(q);
+
     if (!windowTasksModel) {
         windowTasksModel = new WindowTasksModel();
     }
 
+    concatProxyModel->addSourceModel(windowTasksModel);
+
     QObject::connect(windowTasksModel, &QAbstractItemModel::rowsInserted, q, [this]() {
         if (sortMode == SortActivity) {
             updateActivityTaskCounts();
@@ -204,9 +208,6 @@ void TasksModel::Private::initModels()
         startupTasksModel = new StartupTasksModel();
     }
 
-    concatProxyModel = new ConcatenateTasksProxyModel(q);
-
-    concatProxyModel->addSourceModel(windowTasksModel);
     concatProxyModel->addSourceModel(startupTasksModel);
 
     // If we're in manual sort mode, we need to seed the sort map on pending row