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329c8f2fc1
[Area::compare_order()](ee4ab08c8a/crates/egui/src/memory/mod.rs (L1174-L1183))
is not a total ordering. If three layers A, B, and C have the same
`order` field but only A and B are present in `order_map`, then `A==C`
and `B==C` but `A!=C`. This can cause a panic in the stdlib sort
function, and does in [my
app](https://github.com/HactarCE/Hyperspeedcube/tree/v2.0) although it's
very difficult to reproduce.
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