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Refactor MaybeCheckSameAttrVal to streamline old value storage for custom elements

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This commit is contained in:
ownedbywuigi 2026-03-27 11:34:40 +00:00
commit d34a9c5778
1 changed files with 10 additions and 11 deletions
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21
dom/base/Element.cpp
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@ -2336,6 +2336,7 @@ Element::MaybeCheckSameAttrVal(int32_t aNamespaceID,
bool* aOldValueSet)
{
bool modification = false;
CustomElementData* customElementData = GetCustomElementData();
*aHasListeners = aNotify &&
nsContentUtils::HasMutationListeners(this,
NS_EVENT_BITS_MUTATION_ATTRMODIFIED,
@ -2351,13 +2352,14 @@ Element::MaybeCheckSameAttrVal(int32_t aNamespaceID,
if (*aHasListeners || aNotify) {
BorrowedAttrInfo info(GetAttrInfo(aNamespaceID, aName));
if (info.mValue) {
// Check whether the old value is the same as the new one. Note that we
// only need to actually _get_ the old value if we have listeners or
// if the element is a custom element (because it may have an
// attribute changed callback).
if (*aHasListeners || GetCustomElementData()) {
// Need to store the old value.
//
bool valueMatches = aValue.EqualsAsStrings(*info.mValue);
if (valueMatches && aPrefix == info.mName->GetPrefix()) {
return true;
}
// Need to store the old value if listeners are present or this is a
// custom element that may run an attribute-changed callback.
if (*aHasListeners || customElementData) {
// If the current attribute value contains a pointer to some other data
// structure that gets updated in the process of setting the attribute
// we'll no longer have the old value of the attribute. Therefore, we
@ -2368,10 +2370,7 @@ Element::MaybeCheckSameAttrVal(int32_t aNamespaceID,
aOldValue.SetToSerialized(*info.mValue);
*aOldValueSet = true;
}
bool valueMatches = aValue.EqualsAsStrings(*info.mValue);
if (valueMatches && aPrefix == info.mName->GetPrefix()) {
return true;
}
modification = true;
}
}