From: Johannes Schindelin <johannes.schindelin@gmx.de>

As described in https://trojansource.codes/trojan-source.pdf, it is
possible to abuse directional formatting (a feature of Unicode) to
deceive human readers into interpreting code differently from compilers.

It is highly unlikely that Git's source code wants to contain such
directional formatting in the first place, so let's disallow it.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Submitted-As: https://lore.kernel.org/git/pull.1071.git.1635857935312.gitgitgadget@gmail.com