Qt4 fix.

common/group.cpp

@@ -54,7 +54,7 @@ void lcGroup::CreateName(const lcArray<lcGroup*>& Groups)
 		if (Name.startsWith(Prefix))
 		{
 			bool Ok = false;
-			int GroupNumber = Name.midRef(Length).toInt(&Ok);
+			int GroupNumber = Name.mid(Length).toInt(&Ok);
 			if (Ok && GroupNumber > Max)
 				Max = GroupNumber;
 		}

common/lc_model.cpp

@@ -1791,7 +1791,7 @@ QString lcModel::GetGroupName(const QString& Prefix)
 		if (Name.startsWith(Prefix))
 		{
 			bool Ok = false;
-			int GroupNumber = Name.midRef(Length).toInt(&Ok);
+			int GroupNumber = Name.mid(Length).toInt(&Ok);
 			if (Ok && GroupNumber > Max)
 				Max = GroupNumber;
 		}

common/lc_partselectionwidget.h

@@ -57,7 +57,7 @@ public:
 	virtual QVariant headerData(int Section, Qt::Orientation Orientation, int Role = Qt::DisplayRole) const;
 	virtual Qt::ItemFlags flags(const QModelIndex& Index) const;
 
-	PieceInfo* GetPieceInfo(QModelIndex Index) const
+	PieceInfo* GetPieceInfo(const QModelIndex& Index) const
 	{
 		return Index.isValid() ? mParts[Index.row()].first : nullptr;
 	}

qt/lc_qpreferencesdialog.cpp

@@ -423,7 +423,7 @@ bool lcQPreferencesDialog::eventFilter(QObject *object, QEvent *event)
 		return true;
 	}
 
-	return false;
+	return QDialog::eventFilter(object, event);
 }
 
 void lcQPreferencesDialog::updateCommandList()