Published qxkb5, an interface for switching keyboard layouts, allowing you to select different behavior for different windows. For example, for windows with messengers, you can fix only the Russian layout. The program also allows you to use both built-in graphic and text language labels. The code is written in C++ and distributed under the GPLv3 license.
Supported operating modes:
- Normal mode - the active window remembers the last layout;
- First mode β a strict order of language layouts is defined on the active window;
- Fixed mode - there is only one language layout on the active window.
Source: opennet.ru