SDL does not resend OnButton notifications for custom buttons that were added within ShowConstantTBT, UpdateTurnList RPCs

[VjKlepikov]

Bug Report

SDL does not resend OnButton notifications for custom buttons that were added within ShowConstantTBT, UpdateTurnList RPCs Please notice this is a issue which was introduced by fix https://github.com/smartdevicelink/sdl_core/pull/2629

Reproduction Steps

1. SDL and HMI are started
2. Mobile app has assigned "Navigation-1" policy group
3. Mobile app is registered and activated (SDL automatically adds subscription for the CUSTOM_BUTTONS during registration)
4. Mobile app requests ShowConstantTBT and UpdateTurnList RPCs with softButtons(DEFAULT_ACTION)
5. Press added soft buttons HMI sends OnButtonPress and OnButtonEvent notifications to SDL

Expected Behavior

SDL resends OnButtonPress and OnButtonEvent notifications to the mobile app

Observed Behavior

SDL does not resend OnButtonPress and OnButtonEvent notifications to the mobile app

Note: SDL immediately unsubscribes from softButtons after ShowConstantTBT and UpdateTurnList responses from HMI

OS & Version Information

• OS/Version: Ubuntu 18.04
• SDL Core Version: https://github.com/smartdevicelink/sdl_core/tree/develop (1e88e6f3)
• HMI: https://github.com/smartdevicelink/sdl_hmi/tree/develop

[VjKlepikov]

@theresalech Please notice Luxoft team is planning to provide a fix and test scripts

[iCollin]

Closed via https://github.com/smartdevicelink/sdl_core/pull/3839