init

pub fn init(self: *TabsWidget, src: std.builtin.SourceLocation, init_opts: InitOptions, opts: Options) void {
    const scroll_opts: ScrollAreaWidget.InitOpts = switch (init_opts.dir) {
        .horizontal => .{ .vertical = .none, .horizontal = .auto, .horizontal_bar = .hide },
        .vertical => .{ .vertical = .auto, .vertical_bar = .hide },
    };
    self.* = .{
        .init_options = init_opts,
        // SAFETY: Set bellow
        .scroll = undefined,
        // SAFETY: Set bellow
        .group = undefined,
        // SAFETY: Set bellow
        .box = undefined,
    };

    self.scroll.init(src, scroll_opts, defaults.override(opts));

    self.group.init(@src(), .{ .nav_key_dir = self.init_options.dir }, .{ .tab_index = opts.tab_index });

    const margin: Rect = switch (self.init_options.dir) {
        .horizontal => .{ .y = 2 },
        .vertical => .{ .x = 2 },
    };
    self.box.init(@src(), .{ .dir = self.init_options.dir }, .{ .margin = margin, .expand = .both });

    var r = self.scroll.data().contentRectScale().r;
    switch (self.init_options.dir) {
        .horizontal => {
            if (dvui.currentWindow().snap_to_pixels) {
                r.x += 0.5;
                r.w -= 1.0;
                r.y = @floor(r.y) - 0.5;
            }
            dvui.Path.stroke(.{ .points = &.{ r.bottomLeft(), r.bottomRight() } }, .{ .thickness = 1, .color = self.scroll.data().options.color(.border) });
        },
        .vertical => {
            if (dvui.currentWindow().snap_to_pixels) {
                r.y += 0.5;
                r.h -= 1.0;
                r.x = @floor(r.x) - 0.5;
            }
            dvui.Path.stroke(.{ .points = &.{ r.topRight(), r.bottomRight() } }, .{ .thickness = 1, .color = self.scroll.data().options.color(.border) });
        },
    }
}