can't encode non-GBK Character into GB18030

[Clayblockunova]

Describe the bug
can't encode non-GBK Character (like most extended Latin letters and Emoji) into GB18030

To Reproduce

1. Choose "Encode text-Simplified Chinese GB18030";
2. Type non-GBK Character (like "ä" or "😀") in input;
3. Empty bytes would be returned.

Expected behaviour
non-GBK Character should be encoded into corresponding GB18030 bytes (4 bytes per character).

[kryptokazz]

Have you checked that the output matches the correct encoding type?
#1646

[Clayblockunova]

Have you checked that the output matches the correct encoding type? #1646

yes. additionaly, when converting with "input character encoding" option, non-GBK Character also become Empty bytes (1 per 4 UTF16 bytes).