fix(improvise-2mqz): keep download sessions in lockstep

Co-authored-by: Ed Langley <fiddlerwoaroof@users.noreply.github.com>
2026-09-27 17:49:15 +00:00
parent 645cff9a94
commit c355e5e844
3 changed files with 150 additions and 9 deletions
@@ -6605,3 +6605,19 @@ commits.
  `target.view`), run across the whole workspace: fails **only** this test.
 - A composer that hard-codes `"Default"` fails here as well. Neither view in
  this test is `Default`, so the default cannot satisfy it by accident.
+
+### a_download_commit_keeps_the_host_session_mirror_in_lockstep
+
+Codex on PR #329: `LocalThenRequest` closed and cleared the browser's download
+prompt, but the bytes-only request moved no corresponding state in the host's
+session mirror. The test opens SavePrompt through the real browser key path,
+types a nonempty filename, and commits it. It asserts both that the response is
+still `DocumentBytes` and that the host mirror is Normal with an empty save
+buffer. Another session then writes a cell; the requester folds that later
+projection and must still equal its host mirror.
+
+- **Rival** (the pre-fix download handlers, which returned bytes without
+  closing the mirrored prompt): fails at the host-mode assertion with
+  `SavePrompt` versus `Normal`, before the later projection.
+- The nonempty filename proves Enter commits rather than taking the empty-name
+  refusal, and matching `DocumentBytes` preserves the bytes-download ruling.