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Previously, TextInputModel's SetEditingState method was a 1:1 mapping of the underlying protocol used on the text input channel between the framework and the engine. This breaks it up into two methods, which allows the selection to be updated independently of the text, and avoids tying the API the the underlying protocol. This will become more important when we add additional state to support composing regions for multi-step input methods such as those used for Japanese. SetText resets the selection rather than making a best-efforts attempt to preserve it. This choice was primarily to keep the code simple and make the API easier to reason about. An alternative would have been to make a best-effort attempt to preserve the selection, potentially clamping one or both to the end of the new string. In all cases where an embedder resets the string, it is expected that they also have the selection, so can call SetSelection with an updated selection if needed.
Flutter Engine
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