fix: Deep copy options used by dropdown fields #6425
Merged
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Previously the options data structure passed to the dropdown constructor was sometimes copied (in the case of prefix/suffix trimming), but other times it was merely referenced. This meant if options data was used to create one dropdown, then the options data was modified and a second dropdown was created, the first dropdown's options would mysteriously change as well.
This uncovered a broken test that was only passing because of a side effect of the dropdown option data getting modified.