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React in #godot now has object ID-based movement! Previously, it would diff the virtual trees on attributes alone. The colored squares get a random color each time they are instantiated, so the color "stay behind" despite the cells appearing to move.

Each list item is its own HBoxContainer, all stacked in a VBoxContainer. Were you to write this manually without a stateful aid like this, you would use Node.move_child to move each element up and down. Now, the runtime is smart enough to do it itself (provided can you provide a unique ID)