Swap TransparentUi to use a stable sort

[james-j-obrien]

Objective

• Fix the borders, ui and text_wrap_debug examples.

Solution

• Swap TransparentUi to use a stable sort

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This is the smallest change to fix the examples but ideally this is fixed by setting better sort keys for the UI elements such that we can swap back to an unstable sort.

[superdump]

I agree that ideally the sort key would allow unstable sorting to achieve the correct order, but that doesn’t feel like something that needs to be solved now.