[Regression] Konsole does not allow its hotkey to show/hide Konsole (à la Yakuake, Kuake, Guake, Tilda, the "terminal emulator" present in Quake and other games, etc.). That functionality is known as the "background mode" of Konsole.

Previously, a real Konsole survey was done. It was answered by more than 8000 people and the background mode was developed because of this. Robert Knight, a former main developer of Konsole, wrote in http://kdemonkey.blogspot.com.es/2007/04/easter-holiday-terminal-update.html: 

> Implemented a Yakuake-style 'background mode' for Konsole. This means that a shell session 
> is started in the background, which can be displayed or hidden instantly from anywhere by 
> pressing a global shortcut [...] 

> Thanks also to everyone, all 8000+ of you, who took the time to complete the Konsole survey. 
> Your feedback is much appreciated. I have summarised about 2/3rds of the results ( available 
> here [^1] ) so far, and already this week I implemented a number of changes based on the 
> results ( Background mode, SSH bookmarks ). There were many kind words for the developers 
> ( past and present ), always appreciated :) 

> [^1]: https://github.com/robertknight/konsole/blob/master/developer-doc/research/konsole-survey-findings


Reproducible: Always

Steps to Reproduce:
1. Execute: konsole --background-mode
2. Press Ctrl+Shift+F12
3. Nothing happens. it does no longer work?



If anybody needs more information, please ask.