Copypasting key/time signatures

[ThatOnePianist]

Your idea

This is really annoying. When I'm copypasting music, I expect MU to copy everything for me. But if I have a change of key signatures, or, even worse, time signatures, MU just doesn't copy them. This is extremely annoying, as I have to either:

• Copypaste the music before the change of signature, then change the signature, then copypaste the music after the change of signature,
• Change the signature after I copypasted the whole music (which is really messy)

Problem to be solved

This would save a lot of time to do either of the things mentioned above.

Prior art

No response

Additional context

No response

[oktophonie]

Duplicate of #15590