The way how this modifies and backups/restores user option values is a
bit of a problem for runtime option changing.
Clean this up a little. Now cycling the visibility updates the user
option value, but always to "valid" values (unlike hidetimeout used to
be used). If the user option value is changed externally (enabled by a
later commit), it'll be cleanly overwritten.
wm4
db1e28f175