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LibWeb: Improve placement of abspos boxes with dual-auto insets

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When an absolutely positioned box has auto insets on both sides of an
axis, it's placed according to the "static position rectangle". This is,
roughly, the rectangle a box would occupy if it were position:static
instead of position:absolute or position:fixed.

This patch implements a rough, but still significantly better,
estimation of such static positions. It gets pretty hairy in the case
where an abspos box has a parent whose children are inline.
This commit is contained in:
Andreas Kling 2022-10-01 13:48:28 +02:00
parent 74840c5537
commit de6d012367
3 changed files with 71 additions and 17 deletions
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2
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
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@ -447,7 +447,7 @@ void BlockFormattingContext::place_block_level_element_in_normal_flow_vertically
resolve_vertical_box_model_metrics(child_box, available_space, m_state);
auto y = FormattingContext::compute_box_y_position_with_respect_to_siblings(child_box, box_state);
auto y = FormattingContext::compute_box_y_position_with_respect_to_siblings(child_box);
auto clear_floating_boxes = [&](FloatSideData& float_side) {
if (!float_side.current_boxes.is_empty()) {