Re: Assertion failure in xdisp.c

[Richard Stallman]

    This last C-e (which should re-show the header with the copyright notice)
    aborts.  It aborts inside `find_first_unchanged_at_end_row' at the test:

              if (!row->enabled_p || !MATRIX_ROW_DISPLAYS_TEXT_P (row))
                abort ();

I think the idea is that all these rows are supposed to have real data
in them.  If you think that need not be the case, could you investigate
the row that doesn't have the real data, and see why it doesn't?
Is that really valid?  If so, why?