This reverts commit 070016df3becc51d467fbf2e70312106d7392c89.
Thomas and I both submitted different fixes at about the same time.

This reverts parts of
82ea128f190dbe8d707cb140a5a2bb2b48bef58d
e1309004099d1a1c0a9bc1ba6de9e5054629da3c
which were a bit over-zealous at removing "unused" stuff. LGPLv3+/MPL

This reverts commit 817875a7126b403ab029ca1fa06c9d3297bd24b2.

- remove the correct SetUpdateMode()
- Clone() always returns NULL
- SetFont() doesn't do anything