A write to sel leaves the text it wrote selected, as acme's wrsel does, so cat sel reads it back; one open's writes run on from the last

The selection collapsed to a point after the write, so sel read back
nothing. What is written is now dot, and the next write of the same
open goes at its end and grows it (acme's wrselrange), so a shell's
several writes make one selection; another open's write replaces it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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