Add tooltip with filenames

filesystemwidget.h

@@ -23,10 +23,17 @@ signals:
     void reverseSort();
 };
 
+class FileSystemModel : public QFileSystemModel
+{
+public:
+    explicit FileSystemModel(QObject *parent) : QFileSystemModel(parent){}
+    QVariant data(const QModelIndex &index, int role) const override;
+};
+
 class Filetree : public QTreeView
 {
     Q_OBJECT
-    QFileSystemModel *m_fileSystemModel;
+    FileSystemModel *m_fileSystemModel;
     QString m_rootDir;
 public:
     explicit Filetree(QWidget *parent = nullptr);