IMDeleteSurrounding is used by input methods to take multiple
keystrokes and convert them into a special character.  Then the
composing keystrokes are removed.
Before this fix, the cursor placement was not adjusted,
so the special character was inserted in the wrong position
and if 3+ keystrokes were involved, the wrong characters were deleted.

Also fixes "editLine should have focus on accessibleText init."
The first time an accessibleEdit is created, it didnt recognize any
focused text when editing in the "Input Line".

Change-Id: I5be9b75f74d4df82fbd57da3817a626b5fcbeba1
Reviewed-on: https://gerrit.libreoffice.org/15961Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-on: https://gerrit.libreoffice.org/16619