#1 Real TAB logic is missing

[Christian Knecht]

A tab cannot simply be replaced by a fixed number of
charactes. This is valid only in the special case
when tabs are used for indentation. But in general, a
tab can be replaced by any number of charactes
between 1 and n depending on were it appears in the
line.

I attached a example file where the first part is the
original file, the second what the result should be
and the third part what the result currently is
(f3.txt).

[Christian Knecht]

Example