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LibWeb: Include anonymous boxes with no lines into computing BFC height

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Pseudo-elements like ::before and ::after were discarded when their
content property was an empty string (ignoring whitespace), because they
are anonymous containers with no lines.

Our previous way around it was to add an empty line box (see b062a0fb7c)
however it didn't actually work for cases described in the previous
commit.

This makes avatars and cover arts square on last.fm and "fixes" the test
css-pseudo-element-should-not-be-affected-by-presentational-hints.html.
Unfortunately, this also regresses on block-and-inline/clearfix.html,
but that hopefully will be handled in subsequent commit.
This commit is contained in:
Karol Kosek 2023-07-11 12:21:59 +02:00 • committed by Andreas Kling
parent d4b5205482
commit 142d498f14
7 changed files with 37 additions and 25 deletions
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3
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
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@ -568,8 +568,7 @@ CSSPixels BlockFormattingContext::compute_auto_height_for_block_level_element(Bo
auto const& child_box_state = m_state.get(*child_box);
// Ignore anonymous block containers with no lines. These don't count as in-flow block boxes.
if (!child_box->is_table_wrapper() && child_box->is_anonymous() && child_box->is_block_container() && child_box_state.line_boxes.is_empty())
if (margins_collapse_through(*child_box, m_state))
continue;
auto margin_bottom = m_margin_state.current_collapsed_margin();