Running more then 2 engines works incorrect

[VasilyBelyaev]

Describe the bug

When I add 2 engines (or more) and run/stop one of it – all engines runs/stops... Run button of any engine works as «run all added engines»

Reproduction

1. Open any game or analysis board
2. Add more then 1 engine
3. Press «Run» button for any engine
4. All engines are running (should be only one)

Platform and versions

En Croissant 0.15.0 (in 0.11.1 it works)
Windows 10 x64

Stack trace