bug#23205: 25.0.92; sort-tests is flaky

[Philipp Stephani]

On Wed, Apr 6, 2016 at 10:31 AM Paul Eggert <eggert@cs.ucla.edu> wrote:

> Either the sorting should
> be made stable, or the test shouldn't assume stable sorting.

GNU Emacs's sorting is stable, but some sorting code in the test case is wrong,
and the random tests that trigger the test-case bug occur only with a small
probability. I installed the attached to fix the test-case bug. Thanks for
reporting the details; it would have taken a while for me to track it down
without that useful clue involving Zi and zI.

Thanks for the quick fix; confirmed that the test is no longer flaky. 

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