Hovered overlay already accounts for render order, with the exception of
the vanilla WidgetOverlays which are drawn prior to any of our overlays
being drawn. Instead we order them in render-order, which works for the
dynamic-layer ones.
The minimap must be top_right so that our overlays layout around it
correctly, which currently causes it to be picked up first over dynamic
overlays due to the way overlay sorting is done.
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