Christopher Willis-Ford 281a3e256a test: fix flaky test execute/order-changes-backwards-2-broadcast-and-wait-repeat-message.sb2 ...

Before: sprite 3 uses the `wait` block to wait for the other two sprites
to finish. After the `wait` blocks, sprite 3 sends "end" to the test. If
the sprites take too long to finish, they might not be done before the
"end" message.

After: sprite 3 sets a variable called `finished` to zero on startup,
and increments it every time it hears a new message. Each sprite sends
that new message once it's done. When sprite 3 notices that `finished >=
2`, it sends the "end" message.

2022-07-06 13:18:45 -07:00

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