Legacy filter editor vs Filter Effects dialog for cross-version SVG fidelity
Inkscape 0.92 and earlier author filters with a legacy syntax and hard-coded primitive units, while Inkscape 1.0 and later writes filters using a standardized SVG 1.1 style with primitiveUnits="userSpaceOnUse" and additional fe nodes via the Filter Effects dialog. The concrete constraint is sharing a single SVG that must remain visually consistent when opene