Table column parallel sorting may not be visible to other threads.

[lfcnassif]

A long ago, I patched the original JTable RowSorter to use Arrays.parallelSort() instead of Arrays.sort() to speed up column sorting. Arrays.parallelSort() uses the ForkJoin framework to do the work. But surprisingly, at least to me, seems its results may not become visible to other threads and it needs external synchronization to become visible. One consequence of this was reported by @patrickdalla here:
#1333 (comment)
#1333 (comment)

This affects 4.0.x and also several 3.x versions.