New items arrive on every streamed token, and _onChanged jumped to
maxScrollExtent unconditionally — so a reader who scrolled up was
dragged back to the tail continuously for the whole reply. The
_atBottom pin already existed for viewport resizes (T-297); apply it
to the new-item path too, re-checking after layout since the user can
scroll during the frame. Twin tests added beside the T-297 pair:
pinned view keeps following, scrolled-up view stays put.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Raise the declared minimums in pubspec.yaml to what our deps already
require: Flutter >=3.35.0 / Dart >=3.9.0 (was 3.19.0 / 3.5.0). alchemist
0.12 needs Flutter 3.32; Dart 3.9 first ships in Flutter 3.35, so 3.35 is
the binding floor. Pin the exact build toolchain in .fvmrc (Flutter
3.44.1).
Moving to the Dart 3.9 language level switches `dart format` to the new
"tall" style and enables two new lints. This commit is the resulting
mechanical churn, isolated from any behaviour change:
- whole-tree `dart format` reformat (tall style)
- `dart fix` for unnecessary_underscores + use_null_aware_elements
No runtime behaviour change; `make test` green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
When the interaction zone grows/shrinks (composer ↔ permission prompt /
AskUserQuestion, D-78) the conversation viewport changed height but the scroll
offset didn't follow, leaving the last card hidden behind the taller box. Track
whether the view is pinned to the tail; a LayoutBuilder around the list detects
the viewport-height change and re-jumps to the bottom only when pinned, so a
scrolled-up reader is undisturbed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5