Fix AbstractAirspace setDragEnabled honoring input

src/gov/nasa/worldwind/render/airspaces/AbstractAirspace.java

@@ -989,7 +989,7 @@ public boolean isDragEnabled()
     @Override
     public void setDragEnabled(boolean enabled)
     {
-        this.dragEnabled = true;
+        this.dragEnabled = enabled;
     }
 
     @Override

test/gov/nasa/worldwind/render/airspaces/AbstractAirspaceTest.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2006-2009, 2017, 2020 United States Government, as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All rights reserved.
+ *
+ * The NASA World Wind Java (WWJ) platform is licensed under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * NASA World Wind Java (WWJ) also contains the following 3rd party Open Source
+ * software:
+ *
+ *     Jackson Parser – Licensed under Apache 2.0
+ *     GDAL – Licensed under MIT
+ *     JOGL – Licensed under  Berkeley Software Distribution (BSD)
+ *     Gluegen – Licensed under Berkeley Software Distribution (BSD)
+ *
+ * A complete listing of 3rd Party software notices and licenses included in
+ * NASA World Wind Java (WWJ)  can be found in the WorldWindJava-v2.2 3rd-party
+ * notices and licenses PDF found in code directory.
+ */
+package gov.nasa.worldwind.render.airspaces;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(JUnit4.class)
+public class AbstractAirspaceTest
+{
+    @Test
+    public void testSetDragEnabledFalse()
+    {
+        TrackAirspace airspace = new TrackAirspace();
+        airspace.setDragEnabled(false);
+        assertFalse(airspace.isDragEnabled());
+    }
+
+    @Test
+    public void testSetDragEnabledTrue()
+    {
+        TrackAirspace airspace = new TrackAirspace();
+        airspace.setDragEnabled(true);
+        assertTrue(airspace.isDragEnabled());
+    }
+}