It is not possible to open the editor window in octave-gui.Neither by opening
scripts nor by creating a new script nor by explicity opening  it (Ctrl+4).
When closing octave-gui it crashes with 

------snipp-----------
panic: Aborted -- stopping myself...
attempting to save variables to 'octave-workspace'...
panic: attempted clean up failed -- aborting...
octave exited with signal 6
-----snipp-------------

After that, octave-workspace is an empty file. This will not happen with
octave-cli.

up-to-date Tumbleweed from 06/18/2017