codetools: identifier completion: fixed when cursor outside of code, e.g. beyond end of line

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40920 4005530d-fff6-0310-9dd1-cebe43e6787f
codetools: undo hack

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40921 4005530d-fff6-0310-9dd1-cebe43e6787f