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LibWeb: Fix selection when start node is inside end node
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Browse source 
Fixes a regression introduced in
bc8870d019 (in a performant way this
time)
This commit is contained in:
Psychpsyo 2025-07-03 18:33:11 +02:00 • committed by Alexander Kalenik
commit baf2063e31
Notes: github-actions[bot] 2025-07-04 18:20:56 +00:00
6 changed files with 50 additions and 9 deletions
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22
Libraries/LibWeb/Painting/ViewportPaintable.cpp
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@ -362,19 +362,23 @@ void ViewportPaintable::recompute_selection_states(DOM::Range& range)
// 4. Mark the selection end node as End (if text) or Full (if anything else).
if (auto* paintable = end_container->paintable(); paintable && !range.end().node->is_inert()) {
if (is<DOM::Text>(*end_container) || end_container->is_ancestor_of(start_container)) {
if (is<DOM::Text>(*end_container))
paintable->set_selection_state(SelectionState::End);
} else {
paintable->for_each_in_inclusive_subtree([&](auto& layout_node) {
if (!layout_node.dom_node() || !layout_node.dom_node()->is_inert())
layout_node.set_selection_state(SelectionState::Full);
return TraversalDecision::Continue;
});
}
else
paintable->set_selection_state(SelectionState::Full);
}
// 5. Mark the nodes between start node and end node (in tree order) as Full.
for (auto* node = start_container->next_in_pre_order(); node && node != end_container; node = node->next_in_pre_order()) {
// NOTE: If the start node is a descendant of the end node, we cannot traverse from it to the end node since the end node is before it in tree order.
// Instead, we need to stop traversal somewhere inside the end node, or right after it.
DOM::Node* stop_at;
if (start_container->is_descendant_of(end_container)) {
stop_at = end_container->child_at_index(range.end_offset());
} else {
stop_at = end_container;
}
for (auto* node = start_container->next_in_pre_order(); node && node != stop_at; node = node->next_in_pre_order(end_container)) {
if (node->is_inert())
continue;
if (auto* paintable = node->paintable())