Simplify activate() function, do not compete with file browser in case of a brand new session. (Both extensions were checking whether the layout is fresh and attempting to take over the left area.)
Simplify activate() function, do not compete with file browser in case of a brand new session. (Both extensions were checking whether the layout is fresh and attempting to take over the left area.)

jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab