Fix #1077 Fix up ScreenEvent.BackgroundRendered #1500
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Context
In #1077 I advocated for removing this event as no longer necessary, but it turns out this event is still needed after all, for a single very specific case.
Tooltips and item energy bars both render using
RenderType.GUI_OVERLAYwhich has forcedsetDepthTestState(NO_DEPTH_TEST).So the only way to order them correctly is to have the items draw before the tooltip using this event:
Solution notes
There is a better place to fire this event so that it doesn't need many patches: right after the transparent background is drawn. Every normal in-game GUI makes the call to draw that transparent background before their own background.
Technically this is a breaking change, but an extremely minor one. Also, the event was pretty broken before anyway.