make the theme handling in musredit more flexible. At the same time adopted some part to more modern c++.

src/musredit_qt6/musredit/PTextEdit.h

@@ -30,6 +30,8 @@
 #ifndef _PTEXTEDIT_H_
 #define _PTEXTEDIT_H_
 
+#include <memory>
+
 #include <QAction>
 #include <QMainWindow>
 #include <QString>
@@ -46,8 +48,6 @@
 
 #include <QtDebug>
 
-#include <memory>
-
 #include "PAdmin.h"
 #include "musredit.h"
 
@@ -171,15 +171,15 @@ private slots:
   void jumpToBlock(int idx);
 
 private:
-  bool fDarkMenuIcon; ///< flag indicating if a dark or plain icon shall be used in the menu pull-downs
-  bool fDarkToolBarIcon; ///< flag indicating if a dark or plain icon shall be used in the toolbar
+  bool fDarkMenuIcon{false}; ///< flag indicating if a dark or plain icon shall be used in the menu pull-downs
+  bool fDarkToolBarIcon{false}; ///< flag indicating if a dark or plain icon shall be used in the toolbar
   std::unique_ptr<PAdmin> fAdmin; ///< pointer to the xml-startup file informations. Needed for different purposes like default working- and executable directories etc.
   std::unique_ptr<QFileSystemWatcher> fFileSystemWatcher; ///< checks if msr-files are changing on the disk while being open in musredit.
   bool fFileSystemWatcherActive; ///< flag to enable/disable the file system watcher
   QTimer fFileSystemWatcherTimeout; ///< timer used to re-enable file system watcher. Needed to delay the re-enabling
-  QString fLastDirInUse; ///< string holding the path from where the last file was loaded.
+  QString fLastDirInUse{QString("")}; ///< string holding the path from where the last file was loaded.
   QStringList fMusrFTPrevCmd;
-  int fEditW, fEditH;
+  int fEditW{900}, fEditH{800};
 
   QMap<QString, QAction*> fActions;
   std::unique_ptr<QAction> fMusrT0Action;
@@ -189,7 +189,7 @@ private:
 
   std::unique_ptr<QComboBox> fComboFont; ///< combo box for the font selector
   std::unique_ptr<QComboBox> fComboSize; ///< combo box for the font size
-  bool fFontChanging; ///< flag needed to prevent some textChanged feature to occure when only the font changed
+  bool fFontChanging{false}; ///< flag needed to prevent some textChanged feature to occure when only the font changed
   std::unique_ptr<QComboBox> fJumpToBlock; ///< combo box used to jump to the msr-file blocks
 
   std::unique_ptr<QTabWidget> fTabWidget; ///< tab widget in which the text editor(s) are placed