IdeaList looks for a special code sequence at the end of a text defineing the
tabulator width.

These code is as follows:
The last four bytes of a text are Cr-Tab-Cr-Tab and before that there is a
number of tabs, that defines the tab width. 
For instance this text is coded to use a tab width of 5, as the last bytes
are Tab-Tab-Tab-Tab-Tab-Cr-Tab-Cr-Tab.

The evidence:
1234567890123456789012345678901
	6	1	6	1	6	1 (here with tabs of 5 before every digit)
     6    1    6    1    6    1 (here only with blanks)

Don't forget to reset the tab width to the old value after that.