BUG: changing comparison data type should update dataclass value when relevant

[tangkong]

Expected Behavior

Switching a comparison data type should result in changes to the dataclass.

In some senses I am in favor of the current behavior, unless you actually change the value you shouldn't modify the dataclass. But when you change to an enum, a value is filled. It would be unintuitive in this case for ATEF to not apply this value to the dataclass

Current Behavior

If you switch a comparison's data type from e.g. float to enum and leave the combobox alone, it doesn't actually edit the dataclass in such a way to save a change. You have to manually re-select e.g. FALSE again. (Found because my test case was failing on 0.0 != 0/FALSE)

Possible Solution

Fill the values when the type changes

Steps to Reproduce (for bugs)

See current behavior

Context

#241

Your Environment

pcds-5.8.4