Autocomplete may finish words with a different case to what you are actually typing.

Type the following into a document:

"MANCHESTER Manchester manchester"

Now - ensuring autocomplete is on - start to type "manchester" (ie. lower case)
and autocomplete suggests:
manCHESTER

This is not helpful! :)

Autocomplete seems to only collect a word once, and keeps it in whatever case it
first saw the word. So if it saw an all-caps version first, any attempt to type
that word later in lower or mixed case will auto-complete upper case (and
vice-versa for any other type of word case). Obviously this is useless and you
have to type the complete word even though OO already knows what it is...

I can see two solutions:
a) autocomplete remembers the same word separately if the case is different (may
fill up the autocomplete list quickly, and won't help you if you want to type
the word in a case that it hasn't "seen").
b) (much better) autocomplete makes a "judgement" based on the letters you have
already typed as to what the case should be, and adjusts the suggestion
accordingly. Simplest way to do this is to look at the last letter typed. If it
was lower case, the rest of the suggestion should be lower case, otherwise
assume it's an all-caps word. Note this method also works when the first letter
(only) is upper case such as at the beginning of a sentence.

There may be even better (probably more complex) solutions but (b) above seems
trivial to implement (might even make it into 1.1.4?? one can hope..).