Comment 136 for bug 106737

Aceman, given the high popularity of this bug, can't we use the workaround as an interim fix when
renaming foo to Foo:

sourcefolder=foo
targetfolder=Foo
if (lcase(sourcefolder) == lcase(targetfolder)) {
- first rename foo to foo.tmp_random
- then rename foo.tmp_random to Foo }

Renaming folders doesn't happen every day, so taking a split second longer doesn't matter.
That way, it'll work for all types of folders/OSs/POP/Imap no matter what (except for those where the server doesn't allow renaming).
Then, we can spend the next decades looking for the real fix. Or maybe this is the real fix, because even some servers don't accept changing capitalization only, so we'd elegantly trick those.
The only scenario where this might fail are extra long nested folder names at the limit, where we might fail to create the tmp target folder if the tmp path gets too long or such.