FIXUP: Avoid a potential deadlock on the EDT

Signed-off-by: Taylor Smock <taylor.smock@kaart.com>

src/main/java/org/openstreetmap/josm/plugins/mapwithai/data/mapwithai/MapWithAILayerInfo.java

@@ -19,6 +19,8 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.stream.Collectors;
 
+import javax.swing.SwingUtilities;
+
 import org.openstreetmap.josm.data.StructUtils;
 import org.openstreetmap.josm.data.imagery.ImageryInfo;
 import org.openstreetmap.josm.data.preferences.BooleanProperty;
@@ -71,6 +73,8 @@ public class MapWithAILayerInfo {
             if (instance == null) {
                 AtomicBoolean finished = new AtomicBoolean();
                 instance = new MapWithAILayerInfo(() -> finished.set(true));
+                // Avoid a deadlock in the EDT.
+                if (!SwingUtilities.isEventDispatchThread()) {
                     while (!finished.get()) {
                         try {
                             Thread.sleep(100);
@@ -81,6 +85,7 @@ public class MapWithAILayerInfo {
                     }
                 }
             }
+        }
         return instance;
     }