Replace all g_idle_adds with IdleRegister (#3767)

rtgui/wavelet.h

@@ -40,7 +40,7 @@ class Wavelet :
 {
 public:
     Wavelet ();
-    virtual ~Wavelet ();
+    ~Wavelet ();
 
     bool wavComputed_ ();
     void adjusterChanged (ThresholdAdjuster* a, double newBottom, double newTop);
@@ -248,4 +248,6 @@ private:
 
     bool lastmedian, lastmedianlev, lastlinkedg, lastavoid, lastlipst, lasttmr, lastcbenab;
     int nextnlevel;
+
+    IdleRegister idle_register;
 };