LockLayout=0
Layout 3 Three panes visible.

1. Close Tree panel with divider arrow. So now 2 panes visible.
2. Close XnView.
3. Change to LockLayout=1
4. Restart xnview.
5. Reopen Tree panel using divider arrow.
6. *Tree panel size is now shrunken (not same dimensions as above):

Should arrows be locked?
