Properly handle ed-files which fully replace input file content. This
misbehaviour is triggered with 'c' and 'i' commands on empty buffers.

Spotted and fixed by Martin Natano <natano at natano dot n

Properly handle ed-files which fully replace input file content. This
misbehaviour is triggered with 'c' and 'i' commands on empty buffers.

Spotted and fixed by Martin Natano <natano at natano dot net>.

ok millert@

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