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Cache important rule the first time the rule is matched so we don't rely on the declaration for it past that point. (Bug 522595) r=bzbarsky

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This commit is contained in:
L. David Baron 2009-12-11 08:13:19 -08:00
parent 4ee286e827
commit cec495c863
1 changed files with 4 additions and 11 deletions
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15
layout/style/nsCSSStyleRule.cpp
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@ -1409,23 +1409,16 @@ nsCSSDeclaration* CSSStyleRuleImpl::GetDeclaration(void) const
nsIStyleRule* CSSStyleRuleImpl::GetImportantRule(void) nsIStyleRule* CSSStyleRuleImpl::GetImportantRule(void)
{ {
if (!mDeclaration->HasImportantData()) {
NS_ASSERTION(!mImportantRule, "immutable, so should be no important rule");
return nsnull;
}
if (!mImportantRule) {
mImportantRule = new CSSImportantRule(mDeclaration);
if (!mImportantRule)
return nsnull;
NS_ADDREF(mImportantRule);
}
return mImportantRule; return mImportantRule;
} }
/* virtual */ void /* virtual */ void
CSSStyleRuleImpl::RuleMatched() CSSStyleRuleImpl::RuleMatched()
{ {
if (mDeclaration->HasImportantData() && !mImportantRule) {
mImportantRule = new CSSImportantRule(mDeclaration);
NS_IF_ADDREF(mImportantRule);
}
} }
NS_IMETHODIMP NS_IMETHODIMP