One of the menus on the menu bar opens.
Yes, I could try that, but then I could as well change to German layout when I want to enter the ß… The thing is that I have set up all shortcuts for my swedish layout so I would prefer not to change layout.
Maybe it might be possible to adjust the the program to not to listen to alt+menus with the lyrics caret open, but to alt+numpad codes instead?
Strange. This works perfectly for me. I cannot access any menu with its Alt+… command when a pop-over is active.
For what it’s worth, you can install several keyboard layouts on Windows 10 and switch between them easily by pressing Windows+Space. You could use your swedish layout for regular work and switch to another layout that supports the characters you need for lyrics input only.