Index: src/org/openstreetmap/josm/gui/layer/AutosaveTask.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/org/openstreetmap/josm/gui/layer/AutosaveTask.java	(revision 17171)
+++ src/org/openstreetmap/josm/gui/layer/AutosaveTask.java	(date 1602157395909)
@@ -16,6 +16,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.Deque;
 import java.util.HashSet;
@@ -149,7 +150,7 @@
 
             File[] files = deletedLayersDir.listFiles();
             if (files != null) {
-                // FIXME: sort by mtime
+                Arrays.sort(files, Comparator.comparingLong(File::lastModified));
                 deletedLayers.addAll(Arrays.asList(files));
             }