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52070e3df7
MethodChannel and BasicMessageChannel in the C++ wrapper didn't have the expected semantics that passing a null handler would remove any existing handler. This was inconsistent with other platforms and with the lower-level object APIs in this wrapper, and made unregistration in cases where that's desirable more difficult due to needing to keep other object references. Adds tests for this functionality, and some backfill of missing tests for basic handler behavior. See https://github.com/flutter/flutter/issues/51207
This code is intended to be built into plugins and applications to provide higher-level, C++ abstractions for interacting with the Flutter library. Over time, the goal is to move more of this code into the library in a way that provides a usable ABI (e.g., does not use standard library in the interfaces). Note that this wrapper is still in early stages. Expect significant churn in both the APIs and the structure of the wrapper (e.g., the exact set of files that need to be built).