Widget, avoid copying child list when reverse iterating.

[anvilvapre]

I assume that the call to OfType was only used to ensure that not List.Reverse would be called that would reverse the list in place - to ensure LINQ Reverse would be called on an Enumerable.

Or was it meant to filter out null values?

[RoosterDragon]

Or was it meant to filter out null values?

Other places iterate the list forwards without null checks, so yes it must be for the first reason and not as a null guard.

[abcdefg30]

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