A Button state texture's visibility was kept apart from its region's shown bit, so a script `Show()` on a non-current state texture drew nothing. The bar, thumb and ColorSelect setters took a colour form and accepted arguments the reference rejects, the loader built their textures from `file=` or `<Color>` alone, and a bar texture answered nil to `GetTexCoordModifiesRect`.
In the reference, a region has one shown bit that `Show`, `Hide` and the state switch all write. The setters fork on object, path, nil or usage. The loader builds each widget texture as a full Texture element, and installing a bar texture sets its texcoord flag and gives it all points.
All of these now match: one shown bit, the reference's argument forms, full-element textures with their names and texcoords, and no tint without a bar.
Tests pin each.
Fixes#909Fixes#908Fixes#575
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
