Buffer name not updating

[chunkhang]

Steps to reproduce:

1. Launch Vim
2. :split to create new window
3. :edit file2 in that new window
4. Switch back to first window
5. :edit file1 in the first window

What was expected:
The tabline to be # | file1 | file2 |

What happened instead:
The tabline is # | * | file2 |

[bagrat]

This is probably related to the general caching mechanism (in a dict and array). I think we should rather reconsider how we keep the list of the existing buffers or just get the new list every time if the performance will allow to do so.

[chunkhang]

It seems like this line is the culprit.

" If this buffer is already tracked and listed, we're good.
" In case if it is the only buffer, still update, because an empty new
" buffer id is being replaced by a buffer for an existing file.
if is_present && len(s:buffers) > 1
  continue
endif

Currently, we're not updating the buffer if it already exists and there's more than 1 buffer. It works for most cases, but not when you perform the steps mentioned.

[tmerse]

I can confirm something similar happens, if I open a fila from nerdTree via the default "open in new tab"-binding.