ranger.py: fixed issues with $tempfile in embedded shell

Previously, $tempfile (namely, /tmp/chosendir) was not cleaned up
correctly when the ranger process quit in `pwd` without moving to other
directory.  This causes permission errors in multi-user environments
trying to overwrite $tempfile created by a different user.

This commit solves the problem in two ways:

 - Correctly clean up temporary files
 - Avoid writing to the same temporary by using mktemp(1)

0 files changed, 0 insertions, 0 deletions