IME (Korean) support is not working properly.

[wonkyungup]

I’ve tested xterm.dart with IME(Korean) support and it's not quite working correctly.

In Android,
input texts are printed again when I click carriage return.
src/ui/custom_text_edit.dart: updateEditingValue function is called again with the same text plus new line.

In Android.
For example, if "하이" is entered, updateEditingValue is called twice with "하이" and "하이\n".

In iOS,
combined characters are separated when Korean is entered.
Korean from the server is shown fine as shown in the following screenshot.

[wonkyungup]

gboard

• printing Korean character twice like mentioned above

Samsung Keyboard

• doesn't print twice. it prints normally.
• CR should be entered twice in order to work. First Carrige return has no effect.
• If I enter '가나다', only the last character '다' is shown on the cursor.