question about a change to InsetBibtex::getKeys

[Angus Leeming]

I recently changed InsetBibtex::getKeys() so that it was passed a Buffer *. 
It needed this so that it could set
        Path p(buffer->filepath);
without having to use current_view->buffer.

Looking at the code again, I see that "p" is not used to find the file path 
anymore. I'm sure that this is a recent change and I seem to remember reading 
some comments by Jean-Marc in the original code about why it was needed.

Any idea about why it is no longer used anymore? 
If so, then I can remove the Buffer * passed to the function once more.
If not, then it should go back.

Angus