On pen-down the OS drew the "Windows Ink" tap ripple / press-and-hold ring under the nib — ugly and laggy-looking while writing. Set the tablet input service's MicrosoftTabletPenServiceProperty on both the top-level window and the Flutter child (where WM_POINTER lands) with the disable flags (PENTAPFEEDBACK, PRESSANDHOLD, PENBARRELFEEDBACK, TOUCHUIFORCEON/OFF, FLICKS) so the pen draws instantly with no OS animation. Native-only change (windows/runner/flutter_window.cpp); built by CI.
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