<?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>212175</bug_id>
          
          <creation_ts>2020-05-20 16:16:14 -0700</creation_ts>
          <short_desc>[macOS] Scrolling synchronization part 2: Have the scrolling thread detect when the main thread is slow to respond to start a rendering update</short_desc>
          <delta_ts>2020-05-21 08:36:16 -0700</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>WebKit Nightly Build</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>
          
          <blocked>210884</blocked>
          <everconfirmed>1</everconfirmed>
          <reporter name="Simon Fraser (smfr)">simon.fraser</reporter>
          <assigned_to name="Simon Fraser (smfr)">simon.fraser</assigned_to>
          <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>1654704</commentid>
    <comment_count>0</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2020-05-20 16:16:14 -0700</bug_when>
    <thetext>[macOS] Scrolling synchronization part 2: Have the scrolling thread detect when the main thread is slow to respond to start a rendering update</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1654709</commentid>
    <comment_count>1</comment_count>
      <attachid>399908</attachid>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2020-05-20 16:23:08 -0700</bug_when>
    <thetext>Created attachment 399908
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1654931</commentid>
    <comment_count>2</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2020-05-21 08:35:26 -0700</bug_when>
    <thetext>Committed r261999: &lt;https://trac.webkit.org/changeset/261999&gt;

All reviewed patches have been landed. Closing bug and clearing flags on attachment 399908.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1654932</commentid>
    <comment_count>3</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2020-05-21 08:36:16 -0700</bug_when>
    <thetext>&lt;rdar://problem/63494553&gt;</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>399908</attachid>
            <date>2020-05-20 16:23:08 -0700</date>
            <delta_ts>2020-05-21 08:35:26 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-212175-20200520162307.patch</filename>
            <type>text/plain</type>
            <size>5554</size>
            <attacher name="Simon Fraser (smfr)">simon.fraser</attacher>
            
              <data encoding="base64">U3VidmVyc2lvbiBSZXZpc2lvbjogMjYxOTQ4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D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</data>

          </attachment>
      

    </bug>

</bugzilla>