Instead of computing and caching the transform matrix and transform
origin on PaintableBox during resolve_paint_properties(), compute them
inline during assign_accumulated_visual_contexts() where they are
actually consumed. This makes PaintableBox smaller by not wasting space
for properties that are only consumed during AccumulatedVisualContext
tree construction.
Previously, has_scrollable_overflow was a purely geometric check, true
whenever content extended beyond the padding box regardless of the
overflow property. This caused unnecessary scroll frame allocation for
boxes with `overflow:visible`.
Per CSS Overflow 3, scrollable overflow is only defined for scroll
containers (overflow: auto/hidden/scroll). Gate the flag on
`is_scroll_container()` so that only actual scroll containers get scroll
frames assigned.
This change removes premature reset of
`block_container_y_position_update_callback`. Also makes callback
private in `BlockMarginState`, because resetting it independently of
currently accumulated margins is incorrect.
Lots of test expectations are updated, but there is no visual
difference.
Fixes https://github.com/LadybirdBrowser/ladybird/issues/6074
Inline nodes in our layout tree have a position, so let's show it. By
centralizing the logic for this, block nodes now lose their redundant
'content-size' dump info which is already part of the box model dump.
When converting rotate transform functions `sin` and `cos` can sometimes
be inaccurate. To avoid these inaccuracies we:
- Mod the angle to minimise inaccuracies in the first place.
- Discard tiny (smaller than epsilon) values returned by `sin` and
`cos` as inaccuracies.
This is in line with other browsers (e.g. Gecko and WebKit).
This patch just adds the new root paintable and updates the tests
expectations. The next patch will move painting logic from the layout
viewport to the paint viewport.
