We apply svg stroke hairline padding in SVGLayoutSupport::transformPaintInvalidationRect(), but we don't have counterpart representation of the operation in paint property tree, so GeometryMapper don't know how to apply it when mapping a rect.
This is like bug 648769 (about pixel-snapping for scale transform) and bug 648274 (paint property/mapping of multicol contents): GeometryMapper doesn't get enough information from the paint property tree to handle the these extra geometry effects.
Comment 1 by wangxianzhu@chromium.org
, Oct 11 2016Status: Assigned (was: Available)