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>
MultitabController<T> is a Flutter-free ChangeNotifier owning the
tab list, active selection, and reorder/close invariants:
- pinned (non-reorderable) entries form barriers that other tabs
cannot cross
- non-closeable entries silently no-op on remove() so hosts don't
need to gate the call site
- closing the active tab falls right, then left, then to null
- duplicate ids are rejected
MultitabPane<T> is the widget shell: a horizontal tab strip
followed by the active entry's body. Active tab gets the
panelHeader background and a panelActiveBorder top accent;
inactive tabs blend into the tab bar. Close × is hidden until
hover. Add button only renders when onAddRequested is wired.
Hosts route the user's add/close intent through callbacks so the
widget stays domain-free — for the Claude pane, add will spawn a
new tmux session and close will kill one. Drag-to-reorder is
controller-side only for now (the gesture wiring lands with T-24).
19 controller tests + 9 widget tests.
Co-Authored-By: Claude <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8