// right border (physical) remains unpainted.
const wxCoord ofs = dir == wxLayout_RightToLeft ? -1 : 0;
dc.Blit(ofs, 0, rc.right, rc.bottom, &memdc, ofs, 0);
// right border (physical) remains unpainted.
const wxCoord ofs = dir == wxLayout_RightToLeft ? -1 : 0;
dc.Blit(ofs, 0, rc.right, rc.bottom, &memdc, ofs, 0);