Z-index for the backdrop behind a modal opened FROM another modal — a picker that takes the
screen over the dialog that launched it.
A nested modal cannot reuse Z_INDEX_MODAL_BACKDROP: at 450 the inner backdrop paints below
the host dialog's own content at Z_INDEX_MODAL, so it dims the app behind the host but not
the host itself — while Radix's dismissable layer still makes the host inert. The host then looks
live and swallows every click, which is the opposite of what a backdrop is for.
Z-index for the backdrop behind a modal opened FROM another modal — a picker that takes the screen over the dialog that launched it.
A nested modal cannot reuse Z_INDEX_MODAL_BACKDROP: at 450 the inner backdrop paints below the host dialog's own content at Z_INDEX_MODAL, so it dims the app behind the host but not the host itself — while Radix's dismissable layer still makes the host inert. The host then looks live and swallows every click, which is the opposite of what a backdrop is for.
Must stay above Z_INDEX_MODAL and below Z_INDEX_NESTED_MODAL. Pinned by
z-index.test.tsx.