Ticket #12390: RenameLayerConfirmOverwrite.patch

src/org/openstreetmap/josm/actions/RenameLayerAction.java

@@ -83 +83 @@
                     newname += oldname.substring(oldname.lastIndexOf('.'));
                 }
                 File newFile = new File(newname);
+                if (!SaveActionBase.confirmOverwrite(newFile)) return;
                 if (Main.platform.rename(file, newFile)) {
                     layer.setAssociatedFile(newFile);
                     nameText = newFile.getName();