Andreas Kling 877ddaa016 LibWeb: Fix off-by-one in initial containing block overflow calculation ...

We're using the outermost right and bottom child edges to determine the
width and height of the ICB. However, since these edges are *within* the
respective child's rectangle, we have to add 1 when turning them into
width and height values.

This fixes an issue where scrolling a document would shrink its viewport
rect by 1 pixel (on both axes) on every scroll step.

2021-10-23 16:10:44 +02:00

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