Using 2-byte characters on smartphone

There is a problem when entering double-byte characters in nextcloud’s app (Note or new text) with smartphone.

  • File saving is executed for each single character of double-byte character.
  • Characters are not entered correctly.
  • “□” is displayed at the end of the character (PC only. Display only problem.)

I was able to deal with garbled display due to the difference in character code by adding a suitable character code for “filehandleingcontroller.php”.
In case of input, how should I deal? Can I solve this kind of work like adding character codes? Because this is the specification of the application, is it an area I can’t handle?

On PC and Mac, there are some trivial abnormality indications, but overall there is no problem.

Nextcloud version (eg, 10.0.2): 12.0.0
Operating system and version (eg, Ubuntu 16.04): CentOS7.3
Apache or nginx version (eg, Apache 2.4.25): nginx 1.11.10
PHP version (eg, 5.6): PHP 7.1.7