From: Iain Patterson <me@iain.cx>
Date: Wed, 16 Mar 2016 10:04:34 +0000 (+0000)
Subject: Handle the case where $HOME has a trailing slash.
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Handle the case where $HOME has a trailing slash.

$HOME should not have a trailing slash.  But if it does we would eat it
in __ps1_short() and leave an incorrect prompt.
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