Array and spaced list not holding focus when you add an array element

[astroDimitrios]

This happens when you add and sometimes remove an element from the Python/Spaced list types. The array types as well the screen focus seems to jump around.

After:

The focus shifts up so the variable widget is just off the bottom of the screen.

[astroDimitrios]

The default behaviour is somewhere in the grab_focus() gtk/pygobject line of the python_list.py and associated files. There doesn't seem to be a way to turn this off or change the signal so we've added in a force_scroll signal when you focus on the new entry widget so it moves to the top of the screen instead of off the screen. 7363a43