OpenRA/OpenRA — pull request #5917 by pavlos256 (2014-07-10 08:42:24+00:00)
Title: Make tiles sorting deterministic in all cases

This may fix issue #5916.

In any case, it's wanted because this kind of sort is "unstable".
According to the docs:

"This implementation performs an unstable sort; that is, if two
elements are equal, their order might not be preserved."