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LibWeb: Ensure preceding offset is non-negative in float_box()

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When calculating the edge offset of the next floating item based on the
offset of the preceding floating item, we need to ensure that the
preceding offset is always > 0. This isn't explicitly written in the
spec, but all other popular engines do that.

Fixes https://github.com/SerenityOS/serenity/issues/21023
This commit is contained in:
Aliaksandr Kalenik 2023-09-12 00:58:51 +02:00 • committed by Andreas Kling
parent 81ddad3fcf
commit d1e542999c
3 changed files with 51 additions and 1 deletions
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2
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
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@ -962,7 +962,7 @@ void BlockFormattingContext::layout_floating_box(Box const& box, BlockContainer
CSSPixels tentative_offset_from_edge = 0;
bool fits_next_to_preceding_float = false;
if (side == FloatSide::Left) {
tentative_offset_from_edge = preceding_float.offset_from_edge + preceding_float_state.content_width() + preceding_float_state.margin_box_right() + box_state.margin_box_left();
tentative_offset_from_edge = max(preceding_float.offset_from_edge + preceding_float_state.content_width() + preceding_float_state.margin_box_right(), 0) + box_state.margin_box_left();
if (available_space.width.is_definite()) {
fits_next_to_preceding_float = (tentative_offset_from_edge + box_state.content_width() + box_state.margin_box_right()) <= available_space.width.to_px_or_zero();
} else if (available_space.width.is_max_content() || available_space.width.is_indefinite()) {