Aliaksandr Kalenik ea8d0304e9 LibWeb: Create clip and scroll frame trees separately for each navigable ...

While introducing clip and scroll frame trees, I made a mistake by
assuming that the paintable tree includes boxes from nested navigables.
Therefore, this comment in the code was incorrect, and clip/scroll
frames were simply not assigned for iframes:
// NOTE: We only need to refresh the scroll state for traversables
//       because they are responsible for tracking the state of all
//       nested navigables.

As a result, anything with "overflow: scroll" is currently not
scrollable inside an iframe

This change fixes that by ensuring clip and scroll frames are assigned
and refreshed for each navigable. To achieve this, I had to modify the
display list building process to record a separate display list for each
navigable. This is necessary because scroll frame ids are local to a
navigable, making it impossible to call
`DisplayList::apply_scroll_offsets()` on a display list that contains
ids from multiple navigables.

2024-08-10 10:38:12 +02:00

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