8371657: [macosx] Programmatically selecting/deselecting List item triggers an ItemEvent

[mrserb]

When I was working on JDK-8369327 I got a suggestion to update the code that disables unnecessary events:
#27682 (comment)

After checking that code more closely, I found that it does not work in all cases. The checks were first added in JDK-7125456. It looks like only the case for the select method was fixed. Other cases still cause unnecessary events, and even more events happen when trying to add multi selection mode: #27682 (comment)

So I made a new bug for this issue and fixed it separately.

The spec:

  * Adds the specified item listener to receive item events from
  * this list.  Item events are sent in response to user input, but not
  * in response to calls to {@code select} or {@code deselect}.

The new test checks most of the methods in the java.awt.List class. It passes on linux/windows, confirming that the same behavior is implemented in other toolkits (unfortunately on linux it is not stable enough so I had to problemlist it due to JDK-8201307). The test only checks for programmatic changes to the list. I am sure that if I change it to test mix of programmatic/user changes it will fail. I will work on that in a follow up bug.

@aivanov-jdk @azvegint please take a look

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• JDK-8371657: [macosx] Programmatically selecting/deselecting List item triggers an ItemEvent (Bug - P3)

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