extracted_uinodes_z_order.md

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title: "`ExtractedUiNode`'s `stack_index` has been renamed to `z_order` and is now an `f32`."
pull_requests: [19691]

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ExtractedUiNode’s stack_index field has been renamed to z_order and its type changed from u32 to f32. Previously stack_index would be converted into an f32 after extraction during the Render schedule, then offsets would be applied applied to determine draw order before sorting (lowest value rendered first). For example, a node's fill color is given an offset of 0. and a box shadow is given an offset of -0.1, so that the shadow will be drawn behind the node.

Changing the field to an f32, enables finer control of the UI draw order by allowing these offsets to be applied during extraction, and fixes a bug affecting the ordering of texture-sliced nodes.