Can place multiple answer choices on a single answer placeholder

[askingalot]

Even after an answer choice has been placed on an answer placeholder, it is possible to assign another answer choice to it.

Expected Behaviour:
Once an answer placeholder has been assigned an answer, no more answers can be place on it.

[gvwilson]

Good catch - yes, placing an answer should fill the slot.

[askingalot]

This is also related to the nature of the 'undo' enhancements implementation. But I think fixing the bug by 'freezing' a slot after an answer is placed in it is the right solution for now.