set lbr in my
vimrc file but I don't know the meaning of that. What does this option do?
I know it's about line-breaking but I need more explanation.
This is from the Vim document and I can not understand it.
If on, Vim will wrap long lines at a character in 'breakat' rather than at the last character that fits on the screen.
Can someone explain this document to me by an example?