fc08f7491e
Legacy GPv2 code seems to clamp the final computed radius to `0` (at least in some cases, see e.g. line 3992 in `gpencil_stroke_perimeter_ex`). Add a clamping node to the generated geometry node used to mimmic the legacy thickness adjustment in GPv3 converted data. NOTE: There are still some artifacts in testfile used to investigate this issue (`(Anim) 10 Picknick by Susanne Weise.blend`), that looks like invalid radius handling on some curves ends... Clamping _may_ be needed in other places maybe? Pull Request: https://projects.blender.org/blender/blender/pulls/120840