Index: trunk/src/org/openstreetmap/josm/actions/ValidateAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/ValidateAction.java	(revision 14665)
+++ trunk/src/org/openstreetmap/josm/actions/ValidateAction.java	(revision 14666)
@@ -142,6 +142,6 @@
             GuiHelper.runInEDT(() -> {
                 MapFrame map = MainApplication.getMap();
+                map.validatorDialog.unfurlDialog();
                 map.validatorDialog.tree.setErrors(errors);
-                map.validatorDialog.unfurlDialog();
                 //FIXME: nicer way to find / invalidate the corresponding error layer
                 MainApplication.getLayerManager().getLayersOfType(ValidatorLayer.class).forEach(ValidatorLayer::invalidate);