<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>218538</bug_id>
          
          <creation_ts>2020-11-03 15:11:03 -0800</creation_ts>
          <short_desc>[macOS] Toggling dark mode does not update the scrollbar appearance in overflow: scroll elements</short_desc>
          <delta_ts>2020-11-05 08:58:52 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Scrolling</component>
          <version>Safari 14</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Aditya Keerthi">akeerthi</reporter>
          <assigned_to name="Aditya Keerthi">akeerthi</assigned_to>
          <cc>cdumez</cc>
    
    <cc>changseok</cc>
    
    <cc>esprehn+autocc</cc>
    
    <cc>ews-watchlist</cc>
    
    <cc>fred.wang</cc>
    
    <cc>glenn</cc>
    
    <cc>kangil.han</cc>
    
    <cc>kondapallykalyan</cc>
    
    <cc>pdr</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>thorton</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1704234</commentid>
    <comment_count>0</comment_count>
    <who name="Aditya Keerthi">akeerthi</who>
    <bug_when>2020-11-03 15:11:03 -0800</bug_when>
    <thetext>The only way to update the scrollbar&apos;s appearance is by hovering over it.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704235</commentid>
    <comment_count>1</comment_count>
    <who name="Aditya Keerthi">akeerthi</who>
    <bug_when>2020-11-03 15:11:37 -0800</bug_when>
    <thetext>&lt;rdar://problem/68953006&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704236</commentid>
    <comment_count>2</comment_count>
      <attachid>413113</attachid>
    <who name="Aditya Keerthi">akeerthi</who>
    <bug_when>2020-11-03 15:13:58 -0800</bug_when>
    <thetext>Created attachment 413113
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704252</commentid>
    <comment_count>3</comment_count>
      <attachid>413113</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2020-11-03 15:54:59 -0800</bug_when>
    <thetext>Comment on attachment 413113
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=413113&amp;action=review

&gt; Source/WebCore/platform/ScrollableArea.cpp:370
&gt;      m_scrollbarOverlayStyle = overlayStyle;
&gt; +    updateScrollbarOverlayStyle();

Can you only call updateScrollbarOverlayStyle() if it changed?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704257</commentid>
    <comment_count>4</comment_count>
    <who name="Aditya Keerthi">akeerthi</who>
    <bug_when>2020-11-03 16:01:37 -0800</bug_when>
    <thetext>(In reply to Simon Fraser (smfr) from comment #3)
&gt; Comment on attachment 413113 [details]
&gt; Patch
&gt; 
&gt; View in context:
&gt; https://bugs.webkit.org/attachment.cgi?id=413113&amp;action=review
&gt; 
&gt; &gt; Source/WebCore/platform/ScrollableArea.cpp:370
&gt; &gt;      m_scrollbarOverlayStyle = overlayStyle;
&gt; &gt; +    updateScrollbarOverlayStyle();
&gt; 
&gt; Can you only call updateScrollbarOverlayStyle() if it changed?

I think it should be fine to make that change here, but it would be unrelated to the solution.

Note that I&apos;ve made RenderLayer::styleChanged unconditionally call updateScrollbarOverlayStyle(). This is because the scrollbar&apos;s overlay style is always ScrollbarOverlayStyleDefault (regardless of dark/light mode) and we need to call into `[NSScrollerImp setNeedsDisplay:]` to trigger the appearance change.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704269</commentid>
    <comment_count>5</comment_count>
      <attachid>413113</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2020-11-03 16:16:33 -0800</bug_when>
    <thetext>Comment on attachment 413113
Patch

r- because it invalidates scrollbars on every style change which will be a perf hit.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704700</commentid>
    <comment_count>6</comment_count>
      <attachid>413237</attachid>
    <who name="Aditya Keerthi">akeerthi</who>
    <bug_when>2020-11-04 18:24:58 -0800</bug_when>
    <thetext>Created attachment 413237
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704721</commentid>
    <comment_count>7</comment_count>
      <attachid>413237</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2020-11-04 21:07:21 -0800</bug_when>
    <thetext>Comment on attachment 413237
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=413237&amp;action=review

&gt; Source/WebCore/platform/ScrollableArea.cpp:384
&gt;          if (ScrollAnimator* scrollAnimator = existingScrollAnimator())

auto

&gt; Source/WebCore/platform/ScrollableArea.cpp:390
&gt;          if (ScrollAnimator* scrollAnimator = existingScrollAnimator())

auto</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704847</commentid>
    <comment_count>8</comment_count>
      <attachid>413295</attachid>
    <who name="Aditya Keerthi">akeerthi</who>
    <bug_when>2020-11-05 07:26:59 -0800</bug_when>
    <thetext>Created attachment 413295
Patch for landing</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704866</commentid>
    <comment_count>9</comment_count>
      <attachid>413301</attachid>
    <who name="Aditya Keerthi">akeerthi</who>
    <bug_when>2020-11-05 08:19:41 -0800</bug_when>
    <thetext>Created attachment 413301
Patch for landing</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1704883</commentid>
    <comment_count>10</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2020-11-05 08:58:50 -0800</bug_when>
    <thetext>Committed r269437: &lt;https://trac.webkit.org/changeset/269437&gt;

All reviewed patches have been landed. Closing bug and clearing flags on attachment 413301.</thetext>
  </long_desc>
      
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>413113</attachid>
            <date>2020-11-03 15:13:58 -0800</date>
            <delta_ts>2020-11-04 18:24:56 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-218538-20201103181357.patch</filename>
            <type>text/plain</type>
            <size>8867</size>
            <attacher name="Aditya Keerthi">akeerthi</attacher>
            
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>413237</attachid>
            <date>2020-11-04 18:24:58 -0800</date>
            <delta_ts>2020-11-04 21:07:21 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-218538-20201104212458.patch</filename>
            <type>text/plain</type>
            <size>12997</size>
            <attacher name="Aditya Keerthi">akeerthi</attacher>
            
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<flag name="review"
          id="429796"
          type_id="1"
          status="+"
          setter="simon.fraser"
    />
          </attachment>
          <attachment
              isobsolete="1"
              ispatch="1"
              isprivate="0"
          >
            <attachid>413295</attachid>
            <date>2020-11-05 07:26:59 -0800</date>
            <delta_ts>2020-11-05 08:19:54 -0800</delta_ts>
            <desc>Patch for landing</desc>
            <filename>bug-218538-20201105102659.patch</filename>
            <type>text/plain</type>
            <size>13119</size>
            <attacher name="Aditya Keerthi">akeerthi</attacher>
            
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>413301</attachid>
            <date>2020-11-05 08:19:41 -0800</date>
            <delta_ts>2020-11-05 08:58:51 -0800</delta_ts>
            <desc>Patch for landing</desc>
            <filename>bug-218538-20201105111941.patch</filename>
            <type>text/plain</type>
            <size>13117</size>
            <attacher name="Aditya Keerthi">akeerthi</attacher>
            
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</data>

          </attachment>
      

    </bug>

</bugzilla>