This was temporarily removed when introducing proper view abstractions.
Now that we have the cg_xwayland_view struct, we reintroduce this
workaround in its proper place.
This also fixes the previous workaround, which checked whether a view
was *currently* mapped and not if it *has ever* been mapped.
See #18, #19 and 443d955dfd.
With Cage becoming more popular since its mention on Phoronix and
therefore getting more use-cases than just my own project, add XWayland
support. The refactoring of 2cf40f7 makes this much easier. Note that
this is a no-cost addition for those of us not using XWayland as it is a
compile-time option that needs to be explicitly enabled by adding
`-Dxwayland=true` to your meson command.
