Bugfix: Fix focus when moving Cons

Bugfix: Fix focus when moving Cons

When having two v-splits on a horizontal desktop:
----------------
|  t1   |  t3  |
|-------|------|
|  t2   |  t4  |
----------------
…focus is on t2, and you move it into the right v-split (move after h), the
focus was not properly updated. That is, inside the right v-split, focus was
correct, but the workspace focus was still pointing to the left v-split.