1

If ddkP is typed in normal mode on the first line then nothing happens¹. If :nnoremap + ddkP is executed and then + is pressed, the line is deleted. Why?

¹(if file only has one line then a new empty line appears but otherwise the behaviour is the same)

1

Mappings abort on errors, and trying to move further « up » than the first line is an error, so the P never gets executed.

I have some other « bubble » mappings you might be interested in.

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