Check if we hit the left bracket, left parenthesis or left braces, insert the right close character
and set the current position to center the characters.

Change-Id: If1ee8a00799ef0933d5dfd51c32f669a2a27b2a7
Reviewed-on: https://gerrit.libreoffice.org/4374Reviewed-by: Michael Meeks <michael.meeks@suse.com>
Tested-by: Michael Meeks <michael.meeks@suse.com>