Bind behavior scroll state to its document and owner

2026-09-06 06:51:59 +03:00
parent 1b0b072c4b
commit 8c600087dc
2 changed files with 207 additions and 4 deletions
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+# Behavior scroll identity correction
+
+Status: implementation and focused checks passed; full platform checks and native
+acceptance are pending. Base `1b0b072` includes the independently reviewed process
+camera/form corrections in `cf33785`.
+
+The independent actual-Iced probe reproduced a preexisting navigation defect:
+`topology::State::enter` cleared its mirrored offset, but the retained Scrollable
+still held y180 and immediately reported it under the next process owner. The
+reviewer's test is now a repository regression, using Iced's null renderer, real
+layout, wheel input and observer messages. It failed against the original code
+with y180 instead of zero and passes with this correction.
+
+The existing observer now stores its mounted `(document, owner)` identity at
+construction. Its diff recreates local child widget state only when that pair
+changes. Keeping the same owner preserves the actual scrollable and its report;
+revision, epoch, tool and form transitions are deliberately not identity keys.
+No general state framework, model command, schema or persistence change is added.
+The shared observer applies the same lifetime to inner-canvas and outer-page
+scrolling in process and scenario views.
+
+A second actual-Iced regression seeds a programmatic scroll operation before any
+observer report, then varies document, owner, revision/epoch and form-like content
+height. This guards against deriving identity from the last notification. Its
+matrix covers both message families and both scroll areas: only document/owner
+navigation resets to zero, and unchanged-owner edits retain y180. It also verifies
+current event context and one-time reporting. Both defect probes failed before the
+fix; all three observer tests and 22 process tests now pass. Existing passive clamp,
+remount, palette camera, form widget-state and stale-gesture tests remain passing.
+
+The process/native ledger, STATE and other lead-owned documents are untouched.
+The lead owns independent re-review and actual native navigation acceptance.