Index: /applications/editors/josm/plugins/slippy_map_chooser/src/OsmMapControl.java
===================================================================
--- /applications/editors/josm/plugins/slippy_map_chooser/src/OsmMapControl.java	(revision 9584)
+++ /applications/editors/josm/plugins/slippy_map_chooser/src/OsmMapControl.java	(revision 9585)
@@ -71,5 +71,5 @@
 
 	public void mouseDragged(MouseEvent e) {		
-		if (e.getButton() == MouseEvent.BUTTON1 ) {			
+		if((e.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) == MouseEvent.BUTTON1_DOWN_MASK){
 			if (iStartSelectionPoint != null) {				
 				iEndSelectionPoint = e.getPoint();