[m-rev.] for review: d_file_deps improvements

[Zoltan Somogyi]

On Sat, 09 Aug 2025 17:42:11 +0200 (CEST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> For review by anyone.

In the absence of either a review or a promise of one by then,
I intend to commit this in about 24 hours.

Zoltan.