Andreas Kling 32653f34f9 LibWeb: Don't force relayout whole page on programmatic scroll ...

When scrolling the page, we may need to flush any pending layout
changes. This is required because otherwise, we don't know if the target
scroll position is valid.

However, we don't need to *force* a layout. If the layout tree is
already up-to-date, we can use it as-is.

Also, if we're scrolling to (0, 0), we don't need to update the layout
at all, since (0, 0) is always a guaranteed valid scroll position.

2023-03-26 21:46:22 +01:00

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