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    <body><span class="vcard"><a class="email" href="mailto:simon.fraser&#64;apple.com" title="Simon Fraser (smfr) &lt;simon.fraser&#64;apple.com&gt;"> <span class="fn">Simon Fraser (smfr)</span></a>
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              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Updating class name of a shadow host does not update the style applied by :host()"
   href="https://bugs.webkit.org/show_bug.cgi?id=158900">bug 158900</a>
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            <th>What</th>
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           <td style="text-align:right;">Attachment #281623 Flags</td>
           <td>review?
           </td>
           <td>review+
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Updating class name of a shadow host does not update the style applied by :host()"
   href="https://bugs.webkit.org/show_bug.cgi?id=158900#c6">Comment # 6</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Updating class name of a shadow host does not update the style applied by :host()"
   href="https://bugs.webkit.org/show_bug.cgi?id=158900">bug 158900</a>
              from <span class="vcard"><a class="email" href="mailto:simon.fraser&#64;apple.com" title="Simon Fraser (smfr) &lt;simon.fraser&#64;apple.com&gt;"> <span class="fn">Simon Fraser (smfr)</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=281623&amp;action=diff" name="attach_281623" title="Patch">attachment 281623</a> <a href="attachment.cgi?id=281623&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=281623&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=281623&amp;action=review</a>

<span class="quote">&gt; Source/WebCore/style/AttributeChangeInvalidation.cpp:38
&gt; +static bool mayBeAffectedByHostStyle(ShadowRoot&amp; shadowRoot, bool isHTML, const QualifiedName&amp; attributeName)</span >

Can shadowRoot be const?

<span class="quote">&gt; Source/WebCore/style/ClassChangeInvalidation.cpp:88
&gt; +static bool mayBeAffectedByHostStyle(ShadowRoot&amp; shadowRoot, AtomicStringImpl* changedClass)</span >

const shadowRoot?

<span class="quote">&gt; Source/WebCore/style/IdChangeInvalidation.cpp:44
&gt; +static bool mayBeAffectedByHostStyle(ShadowRoot&amp; shadowRoot, const AtomicString&amp; changedId)
&gt; +{
&gt; +    auto&amp; shadowRuleSets = shadowRoot.styleResolver().ruleSets();
&gt; +    if (shadowRuleSets.authorStyle()-&gt;hostPseudoClassRules().isEmpty())
&gt; +        return false;
&gt; +
&gt; +    return shadowRuleSets.features().idsInRules.contains(changedId.impl());
&gt; +}</span >

Can this function that's almost repeated 3 times be shared?</pre>
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