Alex Hoppen a151ca413c Fix a race condition leading to out-of-order notifications in tests ...

`TestSourceKitLSPClient.handle` created a new `Task`. This means that we could swap the order of notifications received from SourceKit-LSP. In most cases this doesn’t matter but `BackgroundIndexingTests.testProduceIndexLogWithTaskID` checks that the notification to start a structured log is received before the first report, which might not be the case because of the `Task` here.

Change `PendingNotifications` to a class with a `ThreadSafeBox` to remove the need for a `Task`.

rdar://147814254

2025-03-27 15:15:11 -07:00

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