ecad29a177
Instead of waiting for the first cell in the share sheet to appear, wait for the first cell matching the predicate to appear. It seems that on macOS 14 it [occasionally doesn't find any matches](https://github.com/flutter/flutter/issues/150117#issuecomment-2163493564), presumably a race condition - so this will wait up to 10 seconds for the desired elements to appear. Attempting to fix https://github.com/flutter/flutter/issues/150117. I wasn't able to recreate locally and it only happens flakily in CI so hard to guarantee it will fix. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style