Only apply collection directories changes on save

src/settings/collectionsettingsdirectorymodel.h

@@ -0,0 +1,48 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2024, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef COLLECTIONSETTINGSDIRECTORYMODEL_H
+#define COLLECTIONSETTINGSDIRECTORYMODEL_H
+
+#include "config.h"
+
+#include <QStandardItemModel>
+#include <QVariant>
+#include <QString>
+#include <QStringList>
+#include <QIcon>
+
+class CollectionSettingsDirectoryModel : public QStandardItemModel {
+  Q_OBJECT
+
+ public:
+  explicit CollectionSettingsDirectoryModel(QObject *parent = nullptr);
+
+  void AddDirectory(const QString &path);
+  void AddDirectories(const QStringList &paths);
+  void RemoveDirectory(const QModelIndex &idx);
+
+  QStringList paths() const { return paths_; }
+
+ private:
+  QIcon dir_icon_;
+  QStringList paths_;
+};
+
+#endif  // COLLECTIONSETTINGSDIRECTORYMODEL_H