Fix problems with missing safety checks in Render::fillBuffer and pdfcomic

common/library_item.h

@@ -0,0 +1,18 @@
+#ifndef __LIBRARY_ITEM_H
+#define __LIBRARY_ITEM_H
+
+#include <QObject>
+
+class LibraryItem : public QObject
+{
+    Q_OBJECT
+public:
+	virtual bool isDir() = 0;
+    LibraryItem & operator=(const LibraryItem & other);
+	QString name;
+	QString path;
+	qulonglong parentId;
+	qulonglong id;
+};
+
+#endif