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LibWeb: Handle text-overflow: ellipsis with trailing whitespace

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We should calculate whether we need to truncate text with an ellipsis
exclusive of any trailing collapsible whitespace.

This was causing issues where an inline element was automatically sized
(e.g. min-content) as we would calculate available width exclusive of
trailing collapsible whitespace and then our text chunk would be wider,
always inserting an ellipsis.

Fixes the visual element of #4048 but we still are incorrect in how we
collapse whitespace more generally
This commit is contained in:
Callum Law 2025-08-11 03:08:18 +12:00 • committed by Sam Atkins
commit 027c9f53be
Notes: github-actions[bot] 2025-08-18 10:01:43 +00:00
3 changed files with 36 additions and 2 deletions
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24
Libraries/LibWeb/Layout/InlineFormattingContext.cpp
View file

@ -350,8 +350,28 @@ void InlineFormattingContext::generate_line_boxes()
&& text_node.computed_values().overflow_x() != CSS::Overflow::Visible) {
// We may need to do an ellipsis if the text is too long for the container
constexpr u32 ellipsis_codepoint = 0x2026;
if (m_available_space.has_value()
&& item.width.to_double() > m_available_space.value().width.to_px_or_zero().to_double()) {
// NOTE: We compute whether we need to truncate the text with an ellipsis based on the width of the
// text node EXCLUSIVE of trailing collapsible whitespace, this is because that trailing
// collapsible whitespace is removed later when we trim the line-boxes anyway.
// Note that this relies on the assumption that this text node is the last in this linebox (as
// there is only one text-node per line box when we have text-wrap: nowrap)
double width_without_trailing_collapsible_whitespace = item.width.to_double();
if (first_is_one_of(text_node.computed_values().white_space_collapse(), CSS::WhiteSpaceCollapse::Collapse, CSS::WhiteSpaceCollapse::PreserveBreaks)) {
auto last_text = text_node.text_for_rendering();
size_t last_fragment_length = last_text.length_in_code_units();
while (last_fragment_length) {
auto last_character = last_text.code_unit_at(--last_fragment_length);
if (!is_ascii_space(last_character))
break;
width_without_trailing_collapsible_whitespace -= item.glyph_run->font().glyph_width(last_character);
}
}
if (m_available_space.has_value() && width_without_trailing_collapsible_whitespace > m_available_space.value().width.to_px_or_zero().to_double()) {
// Do the ellipsis
auto& glyph_run = item.glyph_run;

2
Tests/LibWeb/Ref/expected/text-overflow-ellipsis-with-trailing-whitespace-ref.html Normal file
View file

@ -0,0 +1,2 @@
<!DOCTYPE html>
<span>abc</span>

12
Tests/LibWeb/Ref/input/text-overflow-ellipsis-with-trailing-whitespace.html Normal file
View file

@ -0,0 +1,12 @@
<!DOCTYPE html>
<link rel="match" href="../expected/text-overflow-ellipsis-with-trailing-whitespace-ref.html" />
<style>
#foo {
display: inline-block;
width: min-content;
overflow: hidden;
text-overflow: ellipsis;
text-wrap: nowrap;
}
</style>
<span id="foo">abc </span>