bug#39190: 28.0.50; two buffers with same buffer-file-name (diff-syntax-fontify-props)

[Stefan Monnier]

> This requires more testing, but at least such patch
> basically would look like this:

This looks pretty good to me.  I wonder what Eli thinks about it.

> +(defvar-local buffer-file-name-for-mode nil)

Clearly we'd need a docstring here.

> +      (if (or buffer-file-name buffer-file-name-for-mode)

And now that I think about it, maybe

    (or buffer-file-name-for-mode buffer-file-name)

would be preferable (in case we want to set the major mode of a file
buffer based o a different file name).


        Stefan