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LibWeb: Account for negative margins when calculating float intrusion

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If a box has a negative margin-left, it may have a negative effective
offset within its parent BFC root coordinate system.

We can account for this when calculating the amount of left-side float
intrusion by flooring the X offset at 0.
This commit is contained in:
Andreas Kling 2023-06-04 12:55:55 +02:00
parent 0e5ec8c0ab
commit 89ba00304c
4 changed files with 28 additions and 2 deletions
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Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
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@ -1066,7 +1066,7 @@ FormattingContext::SpaceUsedByFloats BlockFormattingContext::intrusion_by_floats
CSSPixels y_in_root = box_in_root_rect.y() + y_in_box;
auto space_used_by_floats_in_root = space_used_by_floats(y_in_root);
auto left_intrusion = max(CSSPixels(0), space_used_by_floats_in_root.left - box_in_root_rect.x());
auto left_intrusion = max(CSSPixels(0), space_used_by_floats_in_root.left - max(CSSPixels(0), box_in_root_rect.x()));
CSSPixels offset_from_containing_block_chain_margins_between_here_and_root = 0;
for (auto const* containing_block = static_cast<Box const*>(&box); containing_block && containing_block != &root(); containing_block = containing_block->containing_block()) {