Comment 46 for bug 85579

here's a todo list for that patch.

1) not sure why rename of non ascii local folders works (see 1302 in
nsLocalMailFolder.cpp)

2) name of file on disk if not in same char set (see "XXX TODO" in
hashifnecessary). (not necessary for this fix, but getting that work should
allow users to name local folders to non-ASCII and non-system charset values.
japanese folder names on a US-ASCII or Big5 OS)

3) Get/Set MailboxName not wstring friendly, so we use escaped UTF8

4) no Get/Set PRUnicharStringProperty on folder cache element, so again use
escaped UTF8

5) code cleanup