Display search results if the dropdown is closed

[rak-phillip]

Summary

This forces the SelectPrincipal dropdown to display search results if the dropdown has been closed for any reason.

Fixes #16246

Occurred changes and/or fixed issues

• Display search results if the dropdown is closed

Technical notes summary

There are situations where the dropdown can be closed while a user might want to search for a principal, see #16246 for one those cases. This forces the dropdown to reopen when results exist.

Alternatively, we can always force it to open when a search term is applied.

I attempted to prevent the dropdown from closing on click, but there were too many edge cases where the it could still actually close. I found this initial solution to be overly complex and have opted for allowing the dropdown to close and forcing it to open again instead.

Areas or cases that should be tested

Follow the repro steps in the associated issue. Ensure that the results are displayed after typing. Ensure that the results can be selected via mouse and keyboard.

Areas which could experience regressions

There's a possibility that keyboard navigation and selection could be affected. I think this risk is small.

Screenshot/Video

NA

Checklist

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[aalves08]

I checked in 2.14-head and we don't have this component covered in terms of keyboard nav, so there are no regressions in that front. I would say LGTM