Akiba So
25400c8b82
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Eraser preview (user request, "加一个淡一点的描边"): new EraserPreviewPainter shows the eraser circle and a faint red outline over the committed strokes the eraser currently overlaps, so you can see what is about to be deleted. Mounted only in eraser mode (tool or barrel/inverted signal) with a live cursor that follows the hovering/erasing pen; shares _eraserRadius/_pageAspect with the live erase so preview and action always agree. Kept in its own RepaintBoundary. Pen-feel fix (the "写字识别成单击" pan-steal): panEnabled now also requires the last pointer to not be a stylus. Windows fires stylus HOVER before contact, so _lastStylus is already true when the pen touches down -> the InteractiveViewer's pan is disabled BEFORE the stroke's first move, instead of one frame late. A 2+ pointer pinch still always pans (focal translation); a finger/mouse down flips _lastStylus back so finger-pan keeps working. Grounded in Rnote + Saber research: Saber uses the same button detection we have (buttons==kSecondaryButton || invertedStylus); the deeper zoom-flash / draw-vs- pan robustness wants a Saber-style forked InteractiveViewer (single recognizer, decide-at-start) -- scoped as the next step, not done here. 66/66 tests, linux build green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>