Spotify Linux version client can not input Japanese

[ncaq]

Spotify Linux version client can not input Japanese into the search box using Kana-Kanji conversion system.

I can input by copying and pasting.

But that is troublesome.

I am using ibus/mozc, but there is a report that it can not be done with fcitx/mozc.

Do you know the solution?

I enter my environment below.

% spotify --version
/opt/spotify/spotify-client/spotify: /usr/lib64/libcurl.so.4: no version information available (required by /opt/spotify/spotify-client/spotify)
/opt/spotify/spotify-client/spotify: /usr/lib64/libcrypto.so.1.0.0: no version information available (required by /opt/spotify/spotify-client/spotify)
Spotify version 1.0.64.407.g9bd02c2d, Copyright (c) 2017, Spotify Ltd

% uname -a
Linux karen 4.12.12-gentoo #1 SMP Wed Sep 20 13:35:55 JST 2017 x86_64 Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz GenuineIntel GNU/Linux

% ibus version
IBus 1.5.16

% Mozc-2.20.2673.102+24.0.oss