Add setSurfaceSize(tester, width) to the widget harness — the reusable way to
test width-sensitive layout at an ultrawide surface (a wide SizedBox under the
default 800px surface is clamped, so the view's physicalSize must be set), the
foundation T-241 asked for.
Ultrawide cases on the surfaces most prone to width-proportional bugs (the T-239
class): ClideMarquee stays static when a line fits a 3440 slot (it was only
tested narrow); the quick-open palette stays width-capped, not stretched edge to
edge. The status bar already covers 600+3440 (T-239).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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