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If you have a nerdtree file navigation window on the left of the current buffer and use :bd¹, you will find that the nerdtree window will occupy the whole window. When you open another buffer, you have to manually resize the nerdtree window to a smaller size, which is super annoying.

How to prevent this behaviour?

An easy way is to switch to another buffer first, and then delete the previous buffer. We can create a shortcut for this:

nnoremap \d :bp<cr>:bd #<cr>

In the above command, :bp stands for :bprevious, which will change the buffer to the previous buffer. # after the :bd command represents the last used buffer, i.e., the buffer we want to delete.

There is also a Nvim plugin called vim-bufkill, which specifically address this issue. After installing this plugin, you can use :BD to delete the current buffer without closing the window.