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LibWeb: Make sure collapsed margins are not ignored if box creates FC

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Fixes a bug that if box creates new formatting context then all already
collapsed margins are ignored and only margin_top is used.
This commit is contained in:
Aliaksandr Kalenik 2023-05-22 13:03:00 +03:00 committed by Andreas Kling
parent 668578ddc0
commit 76aa17be86
Notes: sideshowbarker 2024-07-18 00:41:35 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/76aa17be86
Pull-request: https://github.com/SerenityOS/serenity/pull/18979
3 changed files with 30 additions and 12 deletions
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6
Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-6.txt Normal file
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@ -0,0 +1,6 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x106 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x90 children: not-inline
BlockContainer <div.upper> at (8,8) content-size 784x20 children: not-inline
BlockContainer <div.bfc> at (8,78) content-size 784x20 [BFC] children: not-inline
BlockContainer <div.inner> at (8,78) content-size 20x20 children: not-inline

15
Tests/LibWeb/Layout/input/block-and-inline/margin-collapse-6.html Normal file
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@ -0,0 +1,15 @@
<!doctype html><style>
.upper {
margin-bottom: 50px;
height: 20px;
background: lime;
}
.bfc {
display: flow-root;
}
.inner {
width: 20px;
height: 20px;
background: black;
}
</style><div class="upper"></div><div class=bfc><div class="inner">

21
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
View file

@ -553,23 +553,20 @@ void BlockFormattingContext::layout_block_level_box(Box const& box, BlockContain
m_margin_state.reset();
}
CSSPixels margin_top = 0;
auto independent_formatting_context = create_independent_formatting_context_if_needed(m_state, box);
m_margin_state.add_margin(box_state.margin_top);
m_margin_state.update_block_waiting_for_final_y_position();
CSSPixels margin_top = m_margin_state.current_collapsed_margin();
if (m_margin_state.has_block_container_waiting_for_final_y_position()) {
// If first child margin top will collapse with margin-top of containing block then margin-top of child is 0
margin_top = 0;
}
if (independent_formatting_context) {
// Margins of elements that establish new formatting contexts do not collapse with their in-flow children
m_margin_state.reset();
margin_top = box_state.margin_top;
} else {
m_margin_state.add_margin(box_state.margin_top);
m_margin_state.update_block_waiting_for_final_y_position();
margin_top = m_margin_state.current_collapsed_margin();
if (m_margin_state.has_block_container_waiting_for_final_y_position()) {
// If first child margin top will collapse with margin-top of containing block then margin-top of child is 0
margin_top = 0;
}
}
place_block_level_element_in_normal_flow_vertically(box, y + margin_top);