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FlutterのTextFieldでIMEの変換確定前にclearするとクラッシュ

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日本語入力で変換の確定前に controller.clear() を呼び出すとクラッシュしてしまいます。

回避策は直前にclearComposing()を実行すること。

controller.clearComposing();
controller.clear();

このようにすればクラッシュは回避できます。

↓このあたりのissueと関係してそうですが、この方法が正しいのかイマイチよくわかりません。。
https://github.com/flutter/engine/pull/6989

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