Ticket #262: josm-issue-262.diff

home/dnaber/workspace/JOSM/src/org/openstreetmap/josm/gui/dialogs/LayerListDialog.java

@@ -22 +22 @@
 import javax.swing.JButton;
 import javax.swing.JLabel;
 import javax.swing.JList;
+import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.ListSelectionModel;
@@ -70 +71 @@
                         Layer l = layer != null ? layer : (Layer)instance.getSelectedValue();
                         if (l instanceof OsmDataLayer && !DontShowAgainInfo.show("delete_layer", tr("Do you really want to delete the whole layer?")))
                                 return;
+                        if (l instanceof OsmDataLayer && ((OsmDataLayer)l).isModified()) {
+                                final int answer = JOptionPane.showConfirmDialog(
+                                                instance, tr("There are unsaved changes. Delete the layer anwyay?"),
+                                                tr("Unsaved Changes"), JOptionPane.YES_NO_OPTION);
+                                if (answer != JOptionPane.YES_OPTION) {
+                                        return;
+                                }
+                        }
                         Main.main.removeLayer(l);
                         if (sel >= instance.getModel().getSize())
                                 sel = instance.getModel().getSize()-1;