Fix: Always include selected options at the top of the list #2066
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This fixes a bug I introduced last week. In trying to fix some other issues, I got rid of the separate piece of code that was rendering the selected options, and instead relied on sorting the existing options to bump the selected ones to the top of the list. This was fine, if the selected values in a dropdown with dynamically fetched options appeared in the first set of results fetched.
I've also shuffled and split the UI tests I wrote. One is being strangely flaky at the moment; the sequence of arrow key presses in the test seems to result in different options being selected each time. I've relaxed that test a bit to just assert that something starting with an 'A' gets selected.