What's the use case of { 'bufnr' } in renderers.file?

[nyngwang]

As title. With or without it I don't see any difference on the resulting neo-tree: no buffer number is shown.

[cseickel]

It has no effect in the filesystem source, but it does show the buffer number in the buffers source. The renderers can technically be specified individually on each source, but since they are 99% the same for all sources, I chose to define them once at the global level and just let the unused components resolve to being empty for cases like that.

[nyngwang]

Thank you!