feat(StatusQ/LeftJoinModel): Add init check on componentComplete

Earier attempts to initialize proxy may fail bc left/right models
may be not ready when they are set. It may lead to a situation where
the model remains uninitialized and reporint 0 row count.

ui/StatusQ/include/StatusQ/leftjoinmodel.h

@@ -2,8 +2,9 @@
 
 #include <QAbstractListModel>
 #include <QPointer>
+#include <QQmlParserStatus>
 
-class LeftJoinModel : public QAbstractListModel
+class LeftJoinModel : public QAbstractListModel, public QQmlParserStatus
 {
     Q_OBJECT
 
@@ -38,6 +39,9 @@ public:
     QHash<int, QByteArray> roleNames() const override;
     QVariant data(const QModelIndex& index, int role) const override;
 
+    void classBegin() override;
+    void componentComplete() override;
+
 signals:
     void leftModelChanged();
     void rightModelChanged();

ui/StatusQ/src/leftjoinmodel.cpp

@@ -271,6 +271,16 @@ QVariant LeftJoinModel::data(const QModelIndex& index, int role) const
     return match.first().data(role - m_rightModelRolesOffset);
 }
 
+void LeftJoinModel::classBegin()
+{
+}
+
+void LeftJoinModel::componentComplete()
+{
+    if (!m_initialized)
+        initializeIfReady(false);
+}
+
 void LeftJoinModel::setLeftModel(QAbstractItemModel* model)
 {
     if (m_leftModel == model)