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There are two different types of code completion lists in NB -- first appears after Ctrl+Space and second appears after one typed name and dot. As I found such functionality as clickOnItem works fine for first type of lists and almost never works for second type. Completion list just disappeared from editor without any effect. Approximately one attempt from ten brings required result. Other functionality like findItemIndex works fine. And more -- clickOnItem return not null but some result.
I wrote a test to test both cases ("Ctrl+Space" and "dot"). In all tested cases (repeated about 15 times, both completion list types) the desired list item was always clicked. I was unable to reproduce the error, closing as WORKSFORME.