CSSTUDIO-3425 Add event handler to propLogScale, and fix setLogScale().

Author: abrahamwolk

app/display/linearmeter/src/main/java/org/csstudio/display/extra/widgets/linearmeter/LinearMeterRepresentation.java

@@ -109,6 +109,11 @@ protected void registerListeners()
         addUntypedWidgetPropertyListener(model_widget.propFont(), layoutChangedListener);
         addUntypedWidgetPropertyListener(model_widget.propNeedleColor(), layoutChangedListener);
 
+        addWidgetPropertyListener(model_widget.propLogScale(), (property, oldValue, newValue) -> {
+            meter.setLogScale(newValue);
+            layoutChanged(null, null, null);
+        });
+
         addWidgetPropertyListener(model_widget.propShowWarnings(), (property, oldValue, newValue) -> {
             meter.setShowWarnings(newValue);
             layoutChanged(null, null, null);

app/display/linearmeter/src/main/java/org/csstudio/display/extra/widgets/linearmeter/RTLinearMeter.java

@@ -300,7 +300,7 @@ public void setDisplayMode(DisplayMode newDisplayMode) {
 
     public void setLogScale(boolean logScale) {
         withWriteLock(() -> {
-            linearMeterScale.setLogarithmic(true);
+            linearMeterScale.setLogarithmic(logScale);
             redraw();
         });
     }