[#76846676] ignore pressing return key when turn on IME.
[#76846676] ignore pressing return key when turn on IME.

Ikuyadeu/smalruby-editor,smalruby/smalruby-editor,smalruby/smalruby-editor,smalruby/smalruby-editor,takaokouji/smalruby-editor,Ikuyadeu/smalruby-editor,takaokouji/smalruby-editor,Ikuyadeu/smalruby-editor,takaokouji/smalruby-editor