Spark List doesn't adjust height of element that is wrapped

Not sure if it's intentional or not, but in the attached test case, the elements that wrap in the Spark List don't have their heights adjusted, like in Flex, so it's hard to navigate. (Not that the Flex behavior is great, either. It's just not garbled together.)

[TestSparkListWrapHeight.mxml.txt](https://github.com/apache/royale-asjs/files/5633474/TestSparkListWrapHeight.mxml.txt)

Start by reproducing the behavior with the attached TestSparkListWrapHeight.mxml.txt test case and inspect how Spark List handles wrapped elements. Done means wrapped elements receive usable heights and the list can be navigated without the content becoming garbled, matching the issue's comparison with Flex.

Written by the indexing model from the issue text.