With the current dev build (2138, not sure about the others), if I add a tab to a text that happen to have columns it will add spaces to match the indent even if "Indent using spaces" is not selected.
For instance, start with a simple list of elements separated by tab:
FOO1 FOO2 FOO3
Then on the second line type:
it will add two spaces before each tab. Additionally it will autocomplete even if we don't want to, i.e. if you start the second column by typing FO<tab> it will automatically autocomplete to FOO3.
Customer support service by UserEcho