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LibWeb: Do not rely on the layout tree for collapsed line breaks

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The editing command that relies the most on this, `insertLinebreak`,
did not perform a layout update after inserting a `<br>` which caused
this algorithm to always return false. But instead of actually building
the layout tree needlessly, we can check the DOM tree instead.
This commit is contained in:
Jelle Raaijmakers 2025-05-01 12:27:42 +02:00 • committed by Alexander Kalenik
parent 71a4e18bf8
commit 295b78f7d3
Notes: github-actions[bot] 2025-05-01 12:45:22 +00:00
3 changed files with 17 additions and 9 deletions
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13
Libraries/LibWeb/Editing/Internal/Algorithms.cpp
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@ -1981,15 +1981,10 @@ bool is_collapsed_line_break(GC::Ref<DOM::Node> node)
return false;
// that begins a line box which has nothing else in it, and therefore has zero height.
auto layout_node = node->layout_node();
if (!layout_node)
return false;
VERIFY(is<Layout::BreakNode>(*layout_node));
// NOTE: We do not generate a TextNode for empty text after the break, so if we do not have a sibling or if that
// sibling is not a TextNode, we consider it a collapsed line break.
auto* next_layout_node = layout_node->next_sibling();
return !is<Layout::TextNode>(next_layout_node);
// NOTE: We check this on the DOM-level by seeing if the next node is neither a non-empty text node nor a <br>.
if (auto text_node = as_if<DOM::Text>(node->next_sibling()))
return text_node->text_content().value_or({}).is_empty();
return !is<HTML::HTMLBRElement>(node->next_sibling());
}
// https://w3c.github.io/editing/docs/execCommand/#collapsed-whitespace-node