Avoid mutating the state while building the Editor's bottom bar

getNote() mutates the state

lib/editors/checklist_editor.dart

@@ -161,7 +161,8 @@ class ChecklistEditorState extends State<ChecklistEditor>
         ],
       ),
       bottomNavigationBar: Builder(
-        builder: (context) => buildEditorBottonBar(context, widget, this),
+        builder: (context) =>
+            buildEditorBottonBar(context, widget, this, widget.note.parent),
       ),
     );
   }

lib/editors/common.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:gitjournal/core/note.dart';
+import 'package:gitjournal/core/notes_folder_fs.dart';
 import 'package:gitjournal/error_reporting.dart';
 import 'package:share/share.dart';
 
@@ -99,9 +100,9 @@ Widget buildEditorBottonBar(
   BuildContext context,
   Editor editor,
   EditorState editorState,
+  NotesFolderFS parentFolder,
 ) {
-  var note = editorState.getNote();
-  var folderName = note.parent.pathSpec();
+  var folderName = parentFolder.pathSpec();
   if (folderName.isEmpty) {
     folderName = "Root Folder";
   }

lib/editors/journal_editor.dart

@@ -86,7 +86,8 @@ class JournalEditorState extends State<JournalEditor> implements EditorState {
       appBar: buildEditorAppBar(widget, this, noteModified: _noteModified),
       body: editor,
       bottomNavigationBar: Builder(
-        builder: (context) => buildEditorBottonBar(context, widget, this),
+        builder: (context) =>
+            buildEditorBottonBar(context, widget, this, note.parent),
       ),
     );
   }

lib/editors/markdown_editor.dart

@@ -117,7 +117,8 @@ class MarkdownEditorState extends State<MarkdownEditor> implements EditorState {
       ),
       body: body,
       bottomNavigationBar: Builder(
-        builder: (context) => buildEditorBottonBar(context, widget, this),
+        builder: (context) =>
+            buildEditorBottonBar(context, widget, this, note.parent),
       ),
     );
   }

lib/editors/raw_editor.dart

@@ -83,7 +83,8 @@ class RawEditorState extends State<RawEditor> implements EditorState {
       appBar: buildEditorAppBar(widget, this, noteModified: _noteModified),
       body: editor,
       bottomNavigationBar: Builder(
-        builder: (context) => buildEditorBottonBar(context, widget, this),
+        builder: (context) =>
+            buildEditorBottonBar(context, widget, this, note.parent),
       ),
     );
   }