New nested folder creation behaviour

[jpincas]

• using the folders extension
• when typing a tag/folder like parent.child
• if parent exists, child is created, as expected under parent
• if parent does NOT exist, then a flat tag named parent.child is created
• I'm not sure if this is intended behaviour, it seems a bit counter intuitive to me - i would have expected parent to be created for me and child under it.
• obviously just my feeling, delete if you think its a terrible idea!