Scope recalls floor and ceiling for WF.

Also some new data in meter so that we can debug and determine if new
data arrived.

meter.cpp

@@ -190,6 +190,7 @@ void meter::paintEvent(QPaintEvent *)
 {
     if(freezeDrawing)
         return;
+
     QPainter painter(this);
     // This next line sets up a canvis within the
     // space of the widget, and gives it coordinates.
@@ -348,6 +349,7 @@ void meter::paintEvent(QPaintEvent *)
     {
         drawLabel(&painter);
     }
+    haveUpdatedData = false;
 }
 
 void meter::drawLabel(QPainter *qp)
@@ -379,6 +381,7 @@ void meter::setLevel(int current)
             this->peak = peakLevels.at(i);
     }
 
+    haveUpdatedData = true;
     this->update();
 }
 
@@ -395,7 +398,8 @@ void meter::setLevels(int current, int peak)
     }
     this->average = sum / std::min(avgPosition, (int)avgLevels.size());
 
-    this->update();
+    haveUpdatedData = true;
+    this->update(); // place repaint event on the event queue
 }
 
 void meter::setLevels(int current, int peak, int average)
@@ -404,7 +408,8 @@ void meter::setLevels(int current, int peak, int average)
     this->peak = peak;
     this->average = average;
 
-    this->update();
+    haveUpdatedData = true;
+    this->update(); // place repaint event on the event queue
 }
 
 void meter::updateDrawing(int num)

meter.h

@@ -52,6 +52,7 @@ private:
     QComboBox *combo = NULL;
     meter_t meterType;
     QString meterShortString;
+    bool haveUpdatedData = false;
     int fontSize = 10;
     int length=30;
     int current=0;

spectrumscope.cpp

@@ -446,6 +446,8 @@ void spectrumScope::setRange(int floor, int ceiling)
 {
     plotFloor = floor;
     plotCeiling = ceiling;
+    wfFloor = floor;
+    wfCeiling = ceiling;
     maxAmp = ceiling;
     if (spectrum != Q_NULLPTR)
         spectrum->yAxis->setRange(QCPRange(floor, ceiling));