Re: [PATCH 1/2] filter-branch: remove an unnecessary use of 'git read-tree'

> From: Johannes Sixt <j6t@kdbg.org>
> 
> The intent of this particular call to 'git read-tree' was to fill an
> index. But in fact, it only allocated an empty index. Later in the
> program, the index is filled anyway by calling read-tree with specific
> commits, and considering that elsewhere the index is even removed (i.e.,
> it is not relied upon that the index file exists), this first call of
> read-tree is completely redundant.