hide_entities() and isolate_entities() can unexpectedly cause freezing

[DanRathbun]

The hide_entities() and isolate_entities() commands can unexpectedly cause freezing.

If the entity is a group or component, and it is already locked, but not hidden, the above commands will cause freezing, by making them both hidden and locked. (Ie, there is no test to determine if the entity is a locked group or component.)

This may be unexpected by the user. A subsequent show_all command will not then make everything that was hidden become visible again.