Function render_grid_rect 

pub fn render_grid_rect<SZ: SizedGrid>(
    szg: &SZ,
    style_for_coord: impl Fn(&SZ::Coord, bool) -> CellStyle,
    label_for_coord: impl Fn(&SZ::Coord) -> Option<String>,
    dark_mode: bool,
    clip: bool,
    min: Vec2,
    max: Vec2,
    grid_offset: Pos2,
    transform: &RectTransform,
    painter: &Painter,
)