<AWT Dev> numAppContexts in AppContext modified in not-thread-safe way.

[Clemens Eisserer]

Hi,

While looking for concurrency issues in caciocavallo-web, I found the
numAppContexts field in AppContext is used in a non-thread-safe way.
Read-modify-write operations aren't atomic on volatile fields.

What do you think about replacing it with an AtomicInteger, as in the patch
attached?

Thanks, Clemens
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