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LibWeb: Don't drop single <br/> lines

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Previously, when having inline contexts consisting of just a `<br/>`
tag, we would not create a line box.

Ensure that there is always a line box when a line is explicitly being
broken and also ensure it won't be trimmed due to being empty.

This will a fix a number of sites that use `<br>` tags for layouts
between block elements (even though the spec says they shouldn't).
This commit is contained in:
Mathis Wiehl 2023-03-15 21:11:38 +01:00 committed by Sam Atkins
parent 2fe4be40af
commit 9927dab993
Notes: sideshowbarker 2024-07-17 08:25:15 +09:00 
Author: https://github.com/fahrradflucht
Commit: https://github.com/SerenityOS/serenity/commit/9927dab993
Pull-request: https://github.com/SerenityOS/serenity/pull/17875
4 changed files with 29 additions and 2 deletions
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8
Tests/LibWeb/Layout/expected/single-br-inline-layout.txt Normal file
View file

@ -0,0 +1,8 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x37.46875 children: not-inline
BlockContainer <body> at (8,8) content-size 784x21.46875 children: not-inline
BlockContainer <div#begin> at (8,8) content-size 784x2 children: not-inline
BlockContainer <(anonymous)> at (8,10) content-size 784x17.46875 children: inline
line 0 width: 0, height: 17.46875, bottom: 17.46875, baseline: 13.53125
BreakNode <br>
BlockContainer <div#end> at (8,27.46875) content-size 784x2 children: not-inline

15
Tests/LibWeb/Layout/input/single-br-inline-layout.html Normal file
View file

@ -0,0 +1,15 @@
<style>
body {
font-family: 'SerenitySans';
}
#begin {
height: 2px;
background-color: blue;
}
#end {
height: 2px;
background-color: red;
}
</style><div id="begin"></div><br><div id="end"></div>

3
Userland/Libraries/LibWeb/Layout/LineBox.h
View file

@ -28,7 +28,7 @@ public:
void trim_trailing_whitespace();
bool is_empty_or_ends_in_whitespace() const;
bool is_empty() const { return m_fragments.is_empty(); }
bool is_empty() const { return m_fragments.is_empty() && !m_has_break; }
private:
friend class BlockContainer;
@ -40,6 +40,7 @@ private:
CSSPixels m_height { 0 };
CSSPixels m_bottom { 0 };
CSSPixels m_baseline { 0 };
bool m_has_break { false };
};
}

5
Userland/Libraries/LibWeb/Layout/LineBuilder.cpp
View file

@ -26,6 +26,9 @@ LineBuilder::~LineBuilder()
void LineBuilder::break_line(Optional<CSSPixels> next_item_width)
{
auto last_line_box = ensure_last_line_box();
last_line_box.m_has_break = true;
update_last_line();
size_t break_count = 0;
bool floats_intrude_at_current_y = false;
@ -305,7 +308,7 @@ void LineBuilder::remove_last_line_if_empty()
{
// If there's an empty line box at the bottom, just remove it instead of giving it height.
auto& line_boxes = m_containing_block_state.line_boxes;
if (!line_boxes.is_empty() && line_boxes.last().fragments().is_empty()) {
if (!line_boxes.is_empty() && line_boxes.last().is_empty()) {
line_boxes.take_last();
m_last_line_needs_update = false;
}