External File Storage: Fix Parent Folder Navigation in Storage Browset (

#3159)

<!-- Thank you for submitting a Pull Request. If you're new to
contributing to BCApps please read our pull request guideline below
* https://github.com/microsoft/BCApps/Contributing.md
-->
#### Summary <!-- Provide a general summary of your changes -->
```
trigger OnAction()
var
    ExternalFileStorage: Codeunit "External File Storage";
    Path: Text;
begin
    ExternalFileStorage.Initialize("File Scenario"::Default);
    Path := ExternalFileStorage.SelectAndGetFolderPath('');
end;
```

Shows no Parent Folder ins Sub Folders.

#### Work Item(s) <!-- Add the issue number here after the #. The issue
needs to be open and approved. Submitting PRs with no linked issues or
unapproved issues is highly discouraged. -->
Fixes #3158

Fixes
[AB#567964](https://dynamicssmb2.visualstudio.com/1fcb79e7-ab07-432a-a3c6-6cf5a88ba4a5/_workitems/edit/567964)

Co-authored-by: Thomas Williamson <[email protected]>

src/System Application/App/External File Storage/src/Lookup/FileAccountBrowserMgt.Codeunit.al

@@ -38,7 +38,8 @@ codeunit 9458 "File Account Browser Mgt."
             ExternalFileStorage.ListDirectories(Path, FilePaginationData, TempFileAccountContent);
         until FilePaginationData.IsEndOfListing();
 
-        ListFiles(TempFileAccountContent, Path, DoNotLoadFiles, CurrentPath, FileNameFilter);
+        ListFiles(TempFileAccountContent, Path, DoNotLoadFiles, FileNameFilter);
+        AddParentFolder(TempFileAccountContent, CurrentPath);
         if TempFileAccountContent.FindFirst() then;
     end;
 
@@ -76,7 +77,7 @@ codeunit 9458 "File Account Browser Mgt."
         ExternalFileStorage.CreateDirectory(ExternalFileStorage.CombinePath(Path, FolderName));
     end;
 
-    local procedure ListFiles(var TempFileAccountContent: Record "File Account Content" temporary; Path: Text; DoNotLoadFields: Boolean; CurrentPath: Text; FileNameFilter: Text)
+    local procedure ListFiles(var TempFileAccountContent: Record "File Account Content" temporary; Path: Text; DoNotLoadFields: Boolean; FileNameFilter: Text)
     var
         TempFileAccountContentToAdd: Record "File Account Content" temporary;
         FilePaginationData: Codeunit "File Pagination Data";
@@ -88,10 +89,10 @@ codeunit 9458 "File Account Browser Mgt."
             ExternalFileStorage.ListFiles(Path, FilePaginationData, TempFileAccountContent);
         until FilePaginationData.IsEndOfListing();
 
-        AddFiles(TempFileAccountContent, TempFileAccountContentToAdd, CurrentPath, FileNameFilter);
+        AddFiles(TempFileAccountContent, TempFileAccountContentToAdd, FileNameFilter);
     end;
 
-    local procedure AddFiles(var TempFileAccountContent: Record "File Account Content" temporary; var FileAccountContentToAdd: Record "File Account Content" temporary; CurrentPath: Text; FileNameFilter: Text)
+    local procedure AddFiles(var TempFileAccountContent: Record "File Account Content" temporary; var FileAccountContentToAdd: Record "File Account Content" temporary; FileNameFilter: Text)
     begin
         if FileNameFilter <> '' then
             FileAccountContentToAdd.SetFilter(Name, FileNameFilter);
@@ -102,11 +103,20 @@ codeunit 9458 "File Account Browser Mgt."
                 TempFileAccountContent.TransferFields(FileAccountContentToAdd);
                 TempFileAccountContent.Insert();
             until FileAccountContentToAdd.Next() = 0;
+    end;
+
+    local procedure AddParentFolder(var TempFileAccountContent: Record "File Account Content" temporary; CurrentPath: Text)
+    var
+        ParentFolder: Text;
+    begin
+        ParentFolder := ExternalFileStorage.GetParentPath(CurrentPath);
+        if ParentFolder = CurrentPath then
+            exit;
 
         TempFileAccountContent.Init();
         TempFileAccountContent.Validate(Name, '..');
         TempFileAccountContent.Validate(Type, TempFileAccountContent.Type::Directory);
-        TempFileAccountContent.Validate("Parent Directory", CopyStr(ExternalFileStorage.GetParentPath(CurrentPath), 1, MaxStrLen(TempFileAccountContent."Parent Directory")));
+        TempFileAccountContent.Validate("Parent Directory", CopyStr(ParentFolder, 1, MaxStrLen(TempFileAccountContent."Parent Directory")));
         TempFileAccountContent.Insert();
     end;