Minimize Tree breaks sub-Paper Folders

[jaywalker32]

Steps to reproduce:

1. Create a sub-Paper folder e.g: paper:sub\testfolder (you can do this by creating a folder called 'sub' inside the <xy>\Data\Paper folder).
2. Navigate to another tab
3. Right-click on 'Mini-Tree' icon and do 'Minimize Tree'
4. Navigate back to the paper folder tab

Expected:
- Paper folder opens as normal

Actual:
- Gives the error "System cannot find the path specified"
- Even manually opening the paper folder via 'Open paper folder' no longer works for this particular paper folder, as long as the sub→testfolder node remains in the mini-tree.

ver: 18.30

[admin]

Confirmed, thanks. Fixed in next version. The mini tree should not contain any Paper Folders at all at the moment. (This is planned for later)