refs #522, mutex for mutable members (thread safe)

* copy/assignment/lock for mutable members
* also removed redundant in status message (slack discussion MS/KB)

src/blackmisc/pixmap.h

@@ -25,7 +25,7 @@ namespace BlackMisc
     {
     public:
         //! Default constructor.
-        CPixmap();
+        CPixmap() = default;
 
         //! Constructor.
         CPixmap(const QPixmap &pixmap);
@@ -57,11 +57,10 @@ namespace BlackMisc
         //! Init the byte array with data
         void fillByteArray();
 
+        QByteArray m_array;                     //!< data of pixmap
         mutable QPixmap m_pixmap;               //!< cached pixmap, mutable because of lazy initialization
         mutable bool m_hasCachedPixmap = false; //!< pixmap? Mutable because of lazy initialization
         mutable QReadWriteLock m_lock;          //!< lock (because of mutable members)
-
-        QByteArray m_array;                     //!< data of pixmap
     };
 } // namespace