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Default: avoid use of opacity for overlay scrollbars

Christian Hergert requested to merge wip/chergert/reduce-overlay-overhead into main

If using the opacity CSS property the renderer cannot optimize these handles without the use of offscreens due to the use of both a border and rgb render node.

Instead, we can apply the alpha to the color values and get the same effect in a way that the GL renderer can optimize without the use of offscreen textures for a sizeable reduction in runtime overhead.

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