This fixes the case where moving a container to a scratchpad hidden
container via a mark would cause the container to be tiling on the
__i3_scratch workspace. This still moves the container to the
__i3_scratch workspace, but properly adds it to the scratchpad so that
it becomes usable instead of requiring criteria to regain access to.
Was a small typo.
This also has the (positive) side-effect of allowing to move all the
content of a marked workspace next to the target container, see added
tests.
Brian Ashworth