Bug 420008

SUMMARY
The CTRL+B hotkey for adding a bookmark in Konsole conflicts with several heavily used terminal programs (notably tmux and vim/vi).

STEPS TO REPRODUCE
1. Install tmux and run the `tmux` command
2. Try to open a new pane with either CTRL+B + % or CTRL+B + "
3. 

OBSERVED RESULT
The pane does not open. Instead a bookmark is silently added to the Konsole bookmarks tab

EXPECTED RESULT
The pane opens.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION
Would love if there were an option in Settings to change this hotkey, it seriously throws off the workflow to have default major key combinations conflicting with ones terminal. Thanks for all your work on the project. I can also help with the bug, if you can point to the code repo and installation instructions.