Aliaksandr Kalenik 5285e22f2a LibWeb+WebContent: Move scrollbar painting into WebContent ...

The main intention of this change is to have a consistent look and
behavior across all scrollbars, including elements with
`overflow: scroll` and `overflow: auto`, iframes, and a page.

Before:
- Page's scrollbar is painted by Browser (Qt/AppKit) using the
  corresponding UI framework style,
- Both WebContent and Browser know the scroll position offset.
- WebContent uses did_request_scroll_to() IPC call to send updates.
- Browser uses set_viewport_rect() to send updates.

After:
- Page's scrollbar is painted on WebContent side using the same style as
  currently used for elements with `overflow: scroll` and
  `overflow: auto`. A nice side effects: scrollbars are now painted for
  iframes, and page's scrollbar respects scrollbar-width CSS property.
- Only WebContent knows scroll position offset.
- did_request_scroll_to() is no longer used.
- set_viewport_rect() is changed to set_viewport_size().

2024-06-05 07:03:42 +02:00

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