Just to be clear, we do use a stable sort.
But as you say, other factors weigh into the floating point precision.
I can imagine a feature (a checkbox) on a collection to sort the game objects based on their tree position.
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Hmm, how this collection will works with other ones? Or what happens if we add objects through factory to this collection?
Good questions, and we would of course need to design this big feature.
But my gut feeling is that they should work as (closely as possible as) the gui currently does today.
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i found how to do! you just set the object’s z-position to more then zero for example:
i want my barrel to be behind the second barrel, i just adjust the second barell’s z-position to 1!
This huge, enormous issue is still unfixed after 5 years? And instead everything is drawn in alphabetical order in the collection view? This makes absolutely zero sense. 
Having same problem, GUI overlaps other game objects in collection, like factories and game controllers and its not possible to change render/display order. Setting Z position to values higher than zero doesnt work.