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LibWeb: Do not assume the shadow root has a host when updating selection

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For example, if the shadow root was detached from the document in some
manner, its host will be null.
This commit is contained in:
Timothy Flynn
2024-08-29 12:21:26 -04:00
committed by Andreas Kling
parent 59fe7ca830
commit 8fb2cc2be1
3 changed files with 25 additions and 5 deletions
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1
Tests/LibWeb/Text/expected/DOM/FormAssociatedElement-selection-type-change.txt Normal file
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@@ -0,0 +1 @@
12389 PASS (didn't crash)

17
Tests/LibWeb/Text/input/DOM/FormAssociatedElement-selection-type-change.html Normal file
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@@ -0,0 +1,17 @@
<input type="text" id="input" value="12389" />
<script src="../include.js"></script>
<script>
test(() => {
let input = document.getElementById("input");
input.focus();
input.select();
input.type = "number";
const rect = input.getBoundingClientRect();
internals.click(rect.x + rect.width / 2, rect.y + rect.height / 2);
println("PASS (didn't crash)");
});
</script>

12
Userland/Libraries/LibWeb/Page/EventHandler.cpp
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@@ -1138,7 +1138,9 @@ void EventHandler::update_selection_range_for_input_or_textarea()
auto& root = node.root();
if (!root.is_shadow_root())
return;
auto& shadow_host = *root.parent_or_shadow_host();
auto* shadow_host = root.parent_or_shadow_host();
if (!shadow_host)
return;
// Invoke "set the selection range" on the form associated element
auto selection_start = range->start_offset();
@@ -1147,10 +1149,10 @@ void EventHandler::update_selection_range_for_input_or_textarea()
auto direction = HTML::SelectionDirection::Forward;
Optional<HTML::FormAssociatedTextControlElement&> target {};
if (is<HTML::HTMLInputElement>(shadow_host))
target = static_cast<HTML::HTMLInputElement&>(shadow_host);
else if (is<HTML::HTMLTextAreaElement>(shadow_host))
target = static_cast<HTML::HTMLTextAreaElement&>(shadow_host);
if (is<HTML::HTMLInputElement>(*shadow_host))
target = static_cast<HTML::HTMLInputElement&>(*shadow_host);
else if (is<HTML::HTMLTextAreaElement>(*shadow_host))
target = static_cast<HTML::HTMLTextAreaElement&>(*shadow_host);
if (target.has_value())
target.value().set_the_selection_range(selection_start, selection_end, direction);