Only have one SortingMode class

It doesn't make sense to duplicate it.

lib/core/note.dart

@@ -124,6 +124,10 @@ class Note with ChangeNotifier implements Comparable<Note> {
     return _summary;
   }
 
+  NoteLoadState get loadState {
+    return _loadState;
+  }
+
   Future<NoteLoadState> load() async {
     assert(_filePath != null);
     assert(_filePath.isNotEmpty);

lib/core/notes_cache.dart

@@ -2,16 +2,12 @@ import 'dart:convert';
 import 'dart:io';
 
 import 'package:flutter/material.dart';
+import 'package:gitjournal/settings.dart';
 import 'package:path/path.dart' as p;
 
 import 'package:gitjournal/core/note.dart';
 import 'package:gitjournal/core/notes_folder.dart';
 
-enum NotesCacheSortOrder {
-  Modified,
-  Created,
-}
-
 class NotesCache {
   final String filePath;
   final String notesBasePath;
@@ -58,9 +54,12 @@ class NotesCache {
     }
   }
 
-  Future buildCache(NotesFolder rootFolder, NotesCacheSortOrder sortOrder) {
+  Future buildCache(NotesFolder rootFolder, SortingMode sortOrder) {
+    print("Saving the NotesCache");
     // FIXME: This could be optimized quite a bit
     var files = rootFolder.getAllNotes();
+    assert(files.every((n) => n.loadState == NoteLoadState.Loaded));
+
     files.sort(_buildSortingFunc(sortOrder));
     files = files.sublist(0, 10);
     var fileList = files.map((f) => f.filePath).toList();
@@ -68,21 +67,39 @@ class NotesCache {
     return saveToDisk(fileList);
   }
 
-  Function _buildSortingFunc(NotesCacheSortOrder order) {
+  Function _buildSortingFunc(SortingMode order) {
     switch (order) {
-      case NotesCacheSortOrder.Modified:
+      case SortingMode.Modified:
         return (Note a, Note b) {
-          var a1 = a.modified ?? a.fileLastModified;
+          var aDt = a.modified ?? a.fileLastModified;
-          var b1 = b.modified ?? b.fileLastModified;
+          var bDt = b.modified ?? b.fileLastModified;
-          return b1.compareTo(a1);
+          if (aDt == null && bDt != null) {
+            return -1;
+          }
+          if (aDt != null && bDt == null) {
+            return -1;
+          }
+          if (bDt == null || aDt == null) {
+            return 0;
+          }
+          return bDt.compareTo(aDt);
         };
 
       // FIXE: We should have an actual created date!
-      case NotesCacheSortOrder.Created:
+      case SortingMode.Created:
         return (Note a, Note b) {
-          var a1 = a.created ?? a.fileLastModified;
+          var aDt = a.created ?? a.fileLastModified;
-          var b1 = b.created ?? b.fileLastModified;
+          var bDt = b.created ?? b.fileLastModified;
-          return b1.compareTo(a1);
+          if (aDt == null && bDt != null) {
+            return -1;
+          }
+          if (aDt != null && bDt == null) {
+            return -1;
+          }
+          if (bDt == null || aDt == null) {
+            return 0;
+          }
+          return bDt.compareTo(aDt);
         };
     }
 

lib/state_container.dart

@@ -73,12 +73,10 @@ class StateContainer with ChangeNotifier {
   Future<void> _loadNotes() async {
     // FIXME: We should report the notes that failed to load
     await appState.notesFolder.loadRecursively();
-
+    await _notesCache.buildCache(
-    var sortOrder = NotesCacheSortOrder.Modified;
+      appState.notesFolder,
-    if (Settings.instance.sortingMode == SortingMode.Created) {
+      Settings.instance.sortingMode,
-      sortOrder = NotesCacheSortOrder.Created;
+    );
-    }
-    await _notesCache.buildCache(appState.notesFolder, sortOrder);
   }
 
   Future<void> syncNotes({bool doNotThrow = false}) async {