Tabs and spaces in autoindent mode

Hello, all

In autoindent and noexpandtab mode, Vim will sometimes
repace a carefully chosen combination of tabs and spaces
with another, in which all the spaces are replaced with tabs
except a few trailing ones, corresponding to the remainder
of dividing the indent width by tab width.

The following example uses a tab width of 3 characters. Both
the lines have a single level of indentation, but the second
line is additionally aligned with the `source' inentifier
above, using spaces. It looks thus:

SomeTypeOfMine source,
destination;

If I denote tabs with `_' and spaces with `.' to show the
indentation structure:

___SomeTypeOfMine source,
___...............destination;

When, however, I add a third line, Vim replaces the
alignment spaces with tabs:

___SomeTypeOfMine source,
___...............destination,
__________________buffer;

whereas I expect it not to interfere with my alignment and
retain the tab-space combination:

___SomeTypeOfMine source,
___...............destination,
___...............buffer;

Is it possible?

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