rich:fileUpload is not consistent with already uploaded files

Step to reproduce:

• Create a File document
• Go to Files tab
• Upload at least one file but don't click on "Stored uploaded files"
• press F5 to refresh your page
• See that the list of files that are uploaded is empty (like if you did not upload anything)
• Click "Stored uploaded files"

The file you previously uploaded but which did not appear in the rich:fileUpload was saved and attached to the document. This is tricky because the user could attach some files he didn't know about.

To fix this we should simply change the scope of org.nuxeo.ecm.webapp.filemanager.UploadItemHolder from CONVERSATION to PAGE.

@Name("fileUploadHolder")
@Scope(ScopeType.PAGE)
public class UploadItemHolder implements Serializable {