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LibWeb: Allow partial update of SVG subtrees in layout tree

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We were incorrectly always appending to the nearest ancestor in the
partial update case, even when the node was eligible for replacement.
This commit is contained in:
Andreas Kling 2025-01-20 21:45:46 +01:00 • committed by Andreas Kling
commit 7ae46bf8b7
Notes: github-actions[bot] 2025-01-20 23:09:17 +00:00
3 changed files with 31 additions and 5 deletions
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13
Libraries/LibWeb/Layout/TreeBuilder.cpp
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@ -402,17 +402,20 @@ void TreeBuilder::update_layout_tree(DOM::Node& dom_node, TreeBuilder::Context&
if (dom_node.is_document()) {
m_layout_root = layout_node;
} else if (layout_node->is_svg_box()) {
m_ancestor_stack.last()->append_child(*layout_node);
} else if (should_create_layout_node) {
// Decide whether to replace an existing node (partial tree update) or insert a new one appropriately.
if (must_create_subtree == MustCreateSubtree::No
bool const may_replace_existing_layout_node = must_create_subtree == MustCreateSubtree::No
&& old_layout_node
&& old_layout_node->parent()
&& old_layout_node != layout_node) {
&& old_layout_node != layout_node;
if (may_replace_existing_layout_node) {
old_layout_node->parent()->replace_child(*layout_node, *old_layout_node);
} else {
insert_node_into_inline_or_block_ancestor(*layout_node, display, AppendOrPrepend::Append);
if (layout_node->is_svg_box()) {
m_ancestor_stack.last()->append_child(*layout_node);
} else {
insert_node_into_inline_or_block_ancestor(*layout_node, display, AppendOrPrepend::Append);
}
}
}