CSSTUDIO-3346 Add WidgetPropertyListenser for the "Show Warnings"-property.

Author: abrahamwolk

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

@@ -115,6 +115,11 @@ protected void registerListeners()
         addUntypedWidgetPropertyListener(model_widget.propFont(), layoutChangedListener);
         addUntypedWidgetPropertyListener(model_widget.propNeedleColor(), layoutChangedListener);
 
+        addWidgetPropertyListener(model_widget.propShowWarnings(), (property, oldValue, newValue) -> {
+            meter.setShowWarnings(newValue);
+            layoutChanged(null, null, null);
+        });
+
         addWidgetPropertyListener(model_widget.propShowUnits(), (property, old_value, new_value) -> {
             meter.setShowUnits(new_value);
             layoutChanged(null, null, null);

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

@@ -577,6 +577,11 @@ public void setFont(javafx.scene.text.Font font)
     }
 
     private boolean showWarnings = true;
+
+    public void setShowWarnings(boolean showWarnings) {
+        runOnJavaFXThread(() -> { this.showWarnings = showWarnings; });
+    }
+
     private boolean lag = false;
     private Boolean isValueWaitingToBeDrawn = false;
     private double valueWaitingToBeDrawn;