use_build_context_synchronously and try/catch

[slavap]

No warning in that case, though it should be:

try {
  await aaa(); // SUCCESS
  await bbb(); // FAILURE
} catch (ex, stack) {
  await ccc(context);
}

[srawlins]

CC @goderbauer

[goderbauer]

This does look like a legit false negative.

[srawlins]

Oops I think a duplicate of https://github.com/dart-lang/linter/issues/3028

[pq]

Yep. This is a dup. Closing in favor of #3028.