Alt+N in Konsole opens new tab yet I don’t see this shortcut defined neither in Konsole nor in System Settings ⇨ Keyboard ⇨ Shortcuts.
Where does it come from?
Hi - it’s a toolbar mnemonic:
I only discovered that just now because I don’t normally have a toolbar in my Konsole, and Alt+N did nothing when I first tried it after seeing your post 
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Ah, didn’t think of it.
Thanks for taking a look and solving the mystery.